Deck 14: Mendel and the Gene Idea

Question 1

The fact that all seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment most probably indicates which of the following?

A)None of the traits obeyed the law of segregation.
B)The diploid number of chromosomes in the pea plants was 7.
C)All of the genes controlling the traits were located on the same chromosome.
D)All of the genes controlling the traits behaved as if they were on different chromosomes.
E)The formation of gametes in plants occurs by mitosis only.

Answer 1

D

Question 2

The individual with genotype AaBbCCDdEE can make many kinds of gametes. Which of the following is the major reason?

A)segregation of maternal and paternal alleles
B)recurrent mutations forming new alleles
C)crossing over during prophase I
D)different possible alignments of chromosomes
E)the tendency for dominant alleles to segregate together

Answer 2

D

Question 3

Why did Mendel continue some of his experiments to the F₂ or F₃ generation?

A)to obtain a larger number of offspring on which to base statistics
B)to observe whether or not a recessive trait would reappear
C)to observe whether or not the dominant trait would reappear
D)to distinguish which alleles were segregating
E)to be able to describe the frequency of recombination

Answer 3

B

Question 4

What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?

A)There is considerable genetic variation in garden peas.
B)Traits are inherited in discrete units, and are not the results of "blending."
C)Recessive genes occur more frequently in the F₁ generation than do dominant ones.
D)Genes are composed of DNA.
E)An organism that is homozygous for many recessive traits is at a disadvantage.

Question 5

What do we mean when we use the terms monohybrid cross and dihybrid cross?

A)A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.
B)A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny.
C)A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid cross involves only one.
D)A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two generations.
E)A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio.

Question 6

Why did the F₁ offspring of Mendel's classic pea cross always look like one of the two parental varieties?

A)No genes interacted to produce the parental phenotype.
B)Each allele affected phenotypic expression.
C)The traits blended together during fertilization.
D)One phenotype was completely dominant over another.
E)Different genes interacted to produce the parental phenotype.

Question 7

Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following?

A)his reading and discussion of Darwin's Origin of Species
B)the understanding of particulate inheritance he learned from renowned scientists of his time
C)his discussions of heredity with his colleagues at major universities
D)his experiments with the breeding of plants such as peas and fuchsia
E)his reading of the scientific literature current in the field

Question 8

How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

A)4
B)8
C)16
D)32
E)64

Question 9

When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype?

A)0%
B)25%
C)50%
D)75%
E)100%

Question 10

Given the parents AABBCc × AabbCc, assume simple dominance for each trait and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?

A)1/4
B)1/8
C)3/4
D)3/8
E)1

Question 11

Which of the following is the best statement of the use of the addition rule of probability?

A)the probability that two or more independent events will both occur
B)the probability that two or more independent events will both occur in the offspring of one set of parents
C)the probability that either one of two independent events will occur
D)the probability of producing two or more heterozygous offspring
E)the likelihood that a trait is due to two or more meiotic events

Question 12

In the cross AaBbCc × AaBbCc, what is the probability of producing the genotype AABBCC?

A)1/4
B)1/8
C)1/16
D)1/32
E)1/64

Question 13

Black fur in mice (B)is dominant to brown fur (b). Short tails (T)are dominant to long ?tails (t). What fraction of the progeny of crosses BbTt × BBtt will be expected to have black fur and long tails?

A)1/16
B)3/16
C)3/8
D)1/2
E)9/16

Question 14

In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?

A)1
B)1/2
C)1/4
D)1/6
E)0

Question 15

Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. What does this suggest?

A)that the parents were true-breeding for contrasting traits
B)that the trait shows incomplete dominance
C)that a blending of traits has occurred
D)that the parents were both heterozygous for a single trait
E)that each offspring has the same alleles for each of two traits

Question 16

Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?

A)prophase I of meiosis
B)anaphase II of meiosis
C)metaphase I of meiosis
D)anaphase I of meiosis
E)anaphase of mitosis

Question 17

Which of the following differentiates between independent assortment and segregation?

A)The law of independent assortment requires describing two or more genes relative to one another.
B)The law of segregation requires describing two or more genes relative to one another.
C)The law of segregation requires having two or more generations to describe.
D)The law of independent assortment is accounted for by observations of prophase I.
E)The law of segregation is accounted for by anaphase of mitosis.

Question 18

A sexually reproducing animal has two unlinked genes, one for head shape (H)and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?

A)tt
B)Hh
C)HhTt
D)T
E)HT

Question 19

Mendel accounted for the observation that traits which had disappeared in the F₁ generation reappeared in the F₂ generation by proposing that

A)new mutations were frequently generated in the F₂ progeny, "reinventing" traits that had been lost in the F₁.
B)the mechanism controlling the appearance of traits was different between the F₁ and the ?F₂ plants.
C)traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F₁.
D)the traits were lost in the F₁ due to dominance of the parental traits.
E)members of the F₁ generation had only one allele for each trait, but members of the F₂ had two alleles for each trait.

Question 20

Mendel's second law of independent assortment has its basis in which of the following events of meiosis I?

A)synapsis of homologous chromosomes
B)crossing over
C)alignment of tetrads at the equator
D)separation of homologues at anaphase
E)separation of cells at telophase

Question 21

When both traits are exhibited in the phenotype, it is said that the alleles display

A)co-dominance.
B)incomplete dominance.
C)complete dominance.
D)recessive traits.
E)gene silencing.

Question 22

The frequency of heterozygosity for the sickle-cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following?

A)Mendel's law of independent assortment
B)Mendel's law of segregation
C)Darwin's explanation of natural selection
D)Darwin's observations of competition
E)the malarial parasite changing the allele

Question 23

Which of the following calculations requires that you utilize the addition rule?

A)Calculate the probability of black offspring from the cross AaBb × AaBb, when B is the symbol for black.
B)Calculate the probability of children with both cystic fibrosis and polydactyly when parents are each heterozygous for both genes.
C)Calculate the probability of each of four children having cystic fibrosis if the parents are both heterozygous.
D)Calculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both.
E)Calculate the probability of purple flower colour in a plot of 50 plants seeded from a ?self-fertilizing heterozygous parent plant.

Question 24

(The)________: when two alleles separate from each other and end up in separate gametes.

A)law of independent assortment
B)law of segregation
C)chiasmata
D)Epistasis
E)Aneuploidy

Question 25

Use the following information to answer the questions below.
A certain (hypothetical) organism is diploid, has either blue or orange wings as the consequence of one of its genes on chromosome 12, and has either long or short antennae as the result of a second gene on chromosome 19, as shown in this figure.

A certain female's number 12 chromosomes both have the blue gene and number 19 chromosomes both have the long gene. As cells in her ovaries undergo meiosis, her resulting eggs (ova)may have which of the following?

A)either two number 12 chromosomes with blue genes or two with orange genes
B)either two number 19 chromosomes with long genes or two with short genes
C)either one blue or one orange gene in addition to either one long or one short gene
D)one chromosome 12 with one blue gene and one chromosome 19 with one long gene

Question 26

In cattle, roan coat colour (mixed red and white hairs)occurs in the heterozygous (Rr)offspring of red (RR)and white (rr)homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white?

A)red × white
B)roan × roan
C)white × roan
D)red × roan
E)The answer cannot be determined from the information provided.

Question 27

Cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this?

A)incomplete dominance
B)multiple alleles
C)pleiotropy
D)epistasis
E)codominance

Question 28

Which of the following provides an example of epistasis?

A)Recessive genotypes for each of two genes (aabb)results in an albino corn snake.
B)The allele b17 produces a dominant phenotype, although b1 through b16 do not.
C)In rabbits and many other mammals, one genotype (cc)prevents any fur colour from developing.
D)In Drosophila (fruit flies), white eyes can be due to an X-linked gene or to a combination of other genes.
E)In cacti, there are several genes for the type of spines.

Question 29

Most genes have many more than two alleles. However, which of the following is also true?

A)At least one allele for a gene always produces a dominant phenotype.
B)Most of the alleles will never be found in a live-born organism.
C)All of the alleles but one will produce harmful effects if homozygous.
D)There may still be only two phenotypes for the trait.
E)More than two alleles in a genotype is considered lethal.

Question 30

An obstetrician knows that one of her patients is a pregnant woman whose fetus is at risk for a serious disorder that is detectable genetically in fetal cells. The obstetrician would most reasonably offer which of the following procedures to her patient?

A)CVS
B)ultrasound imaging
C)amniocentesis
D)blood transfusion
E)X-ray

Question 31

Hydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following?

A)the knowledge that multiple alleles are involved
B)the allele for blue hydrangea being completely dominant
C)the alleles being codominant
D)the fact that a mutation has occurred
E)environmental factors such as soil pH

Question 32

Phenylketonuria (PKU)is a recessive human disorder in which an individual cannot appropriately metabolize a particular amino acid. The amino acid is not otherwise produced by humans. Therefore, the most efficient and effective treatment is which of the following?

A)Feed them the substrate that can be metabolized into this amino acid.
B)Transfuse the patients with blood from unaffected donors.
C)Regulate the diet of the affected persons to severely limit the uptake of the amino acid.
D)Feed the patients the missing enzymes in a regular cycle, such as twice per week.
E)Feed the patients an excess of the missing product.

Question 33

A scientist discovers a DNA-based test for one allele of a particular gene. This and only this allele, if homozygous, produces an effect that results in death at or about the time of birth. Of the following, which is the best use of this discovery?

A)Screen all newborns of an at-risk population.
B)Design a test for identifying heterozygous carriers of the allele.
C)Introduce a normal allele into deficient newborns.
D)Follow the segregation of the allele during meiosis.
E)Test school-age children for the disorder.

Question 34

An individual that has two different alleles for the same trait is said to be

A)homozygotic.
B)heterozygotic.
C)recessive.
D)polygenic.
E)pleiotropic.

Question 35

Hutchinson-Gilford progeria is an exceedingly rare human genetic disorder in which there is very early senility and death, usually from coronary artery disease, at an average age of approximately 13. Patients, who look very old even as children, do not live to reproduce. Which of the following represents the most likely assumption?

A)All cases must occur in relatives; therefore, there must be only one mutant allele.
B)Successive generations of a family will continue to have more and more cases over time.
C)The disorder may be due to mutation in a single protein-coding gene.
D)Each patient will have had at least one affected family member in a previous generation.
E)The disease is autosomal dominant.

Question 36

Visitors at Algonquin Park in Northern Ontario may miss out on the brilliant red colouration of Acer sacchrum in autumn because

A)the timing is genetically programmed and the people didn't come at the right time.
B)these animals have already gone into hibernation by then.
C)these trees don't produce anthocyanin so far north.
D)anthocyanin production and chlorophyll loss are responses to environmental cues and it may have happened already.
E)Acer sacchrum doesn't live in the park.

Question 37

________ is when a gene on one locus has an influence on the phenotypic expression of an allele at another locus.

A)Polygenic influence
B)Pleiotropy
C)Multifactorial occurrence
D)Epistasis
E)Segregation

Question 38

Which of the following is an example of polygenic inheritance?

A)pink flowers in snapdragons
B)the ABO blood group in humans
C)Huntington's disease in humans
D)white and purple flower colour in peas
E)skin pigmentation in humans

Question 39

Which of the following describes the ability of a single gene to have multiple phenotypic effects?

A)incomplete dominance
B)multiple alleles
C)pleiotropy
D)epistasis

Question 40

An obstetrician knows that one of her patients is a pregnant woman whose fetus is at risk for a serious disorder that is detectable biochemically in fetal cells. The obstetrician would most reasonably offer which of the following procedures to her patient?

A)CVS
B)ultrasound imaging
C)amniocentesis
D)blood transfusion
E)X-ray

Question 41

Use the following information to answer the questions below.
Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be either all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies.
In one type cross of black × black, the results were as follows: 9/16 black
4/16 yellow
3/16 brown
The genotype aabb must result in which of the following?

A)black
B)brown
C)yellow
D)a lethal result
E)white

Question 42

Use the following information to answer the questions below.
Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be either all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies.
How many genes must be responsible for these coat colours in Labrador retrievers?

A)1
B)2
C)3
D)4
E)5

Question 43

Use the following pedigree shown below for a family in which dark-shaded symbols represent individuals with one of the two major types of colon cancer. Numbers under the symbols are the individual's age at the time of diagnosis.

In each generation of this family after generation I, the age at diagnosis is significantly lower than would be found in nonfamilial (sporadic)cases of this cancer (~ 63 years). What is the most likely reason?

A)Members of this family know to be checked for colon cancer early in life.
B)Hereditary (or familial)cases of this cancer typically occur at earlier ages than do nonfamilial forms.
C)This is pure chance; it would not be expected if you were to look at a different family.
D)This cancer requires mutations in more than this one gene.
E)Affected members of this family are born with colon cancer, and it can be detected whenever they are first tested.

Question 44

The following questions refer to the pedigree chart in the figure below for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle.

What is the probability that individual III-1 is Ww?

A)3/4
B)1/4
C)2/4
D)2/3
E)1

Question 45

Use the following information to answer the questions below.
Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a ?white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant characteristic.
If true-breeding red long radishes are crossed with true-breeding white oval radishes, the ?F₁ will be expected to be which of the following?

A)red and long
B)red and oval
C)white and long
D)purple and long
E)purple and oval

Question 46

Use the following information to answer the questions below.
Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a ?white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant characteristic.
In the F₂ generation of the above cross, which of the following phenotypic ratios would be expected?

A)9:3:3:1
B)9:4:3
C)1:1:1:1
D)1:1:1:1:1:1
E)6:3:3:2:1:1

Question 47

Use the following pedigree shown below for a family in which dark-shaded symbols represent individuals with one of the two major types of colon cancer. Numbers under the symbols are the individual's age at the time of diagnosis.

The affected woman in generation IV is thinking about her future and asks her oncologist (cancer specialist)whether she can know whether any or all of her children will have a high risk of the same cancer. The doctor would be expected to advise which of the following? I. genetic counselling
II. prenatal diagnosis when/if she becomes pregnant
III. testing to see whether she has the allele
IV. testing to see whether her future spouse or partner has the allele

A)I only
B)II only
C)I and II only
D)I, II, and III only
E)III and IV only

Question 48

The following questions refer to the pedigree chart in the figure below for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle.

What is the likelihood that the progeny of IV-3 and IV-4 will have the trait?

A)0%
B)25%
C)50%
D)75%
E)100%

Question 49

Use the following information to answer the questions below.
Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be either all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies.
These results indicate which of the following?

A)Brown is dominant to black.
B)Black is dominant to brown and to yellow.
C)Yellow is dominant to black.
D)There is incomplete dominance.
E)Epistasis is involved.

Question 50

Use the following information to answer the questions below.
A certain (hypothetical) organism is diploid, has either blue or orange wings as the consequence of one of its genes on chromosome 12, and has either long or short antennae as the result of a second gene on chromosome 19, as shown in this figure.

A female with a paternal set of one orange and one long gene chromosome and a maternal set comprised of one blue and one short gene chromosome is expected to produce which of the following types of eggs after meiosis?

A)All eggs will have maternal types of gene combinations.
B)All eggs will have paternal types of gene combinations.
C)Half the eggs will have maternal and half will have paternal combinations.
D)Each egg has a one-fourth chance of having either blue long, blue short, orange long, or orange short combinations.
E)Each egg has a three-fourths chance of having blue long, one-fourth blue short, three-fourths orange long, or one-fourth orange short combinations.

Question 51

Use the following information to answer the questions below.
A certain (hypothetical) organism is diploid, has either blue or orange wings as the consequence of one of its genes on chromosome 12, and has either long or short antennae as the result of a second gene on chromosome 19, as shown in this figure.

If a female of this species has one chromosome 12 with a blue gene and another chromosome 12 with an orange gene, and has both number 19 chromosomes with short genes, she will produce which of the following egg types?

A)only blue short gene eggs
B)only orange short gene eggs
C)one-half blue short and one-half orange short gene eggs
D)three-fourths blue long and one-fourth orange short gene eggs
E)three-fourths blue short and one-fourth orange short gene eggs

Question 52

Use the following pedigree shown below for a family in which dark-shaded symbols represent individuals with one of the two major types of colon cancer. Numbers under the symbols are the individual's age at the time of diagnosis.

What is the genotype of the deceased individual in generation II?

A)homozygous for a gene for colon cancer
B)homozygous for both cancer alleles from his mother
C)heterozygous for a gene for colon cancer
D)affected by the same colon cancer environmental factor as his mother
E)carrier of all of the several known genes for colon cancer

Question 53

Use the following description and figure to answer the questions below.
In a particular plant, leaf colour is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding dark-leaved plant is crossed with a light-leaved one, and the F₁ offspring is allowed to self-pollinate. The predicted outcome of the F₂ is diagrammed in the Punnett square shown in Figure 14.1, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square.

Which of the plants will be true-breeding?

A)1 and 4 only
B)2 and 3 only
C)1, 2, 3, and 4
D)1 only
E)1 and 2 only

Question 54

Use the following pedigree shown below for a family in which dark-shaded symbols represent individuals with one of the two major types of colon cancer. Numbers under the symbols are the individual's age at the time of diagnosis.

From this pedigree, how does this trait seem to be inherited?

A)from mothers
B)as an autosomal recessive
C)as a result of epistasis
D)as an autosomal dominant
E)as an incomplete dominant

Question 55

The following questions refer to the pedigree chart in the figure below for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle.

What is the genotype of individual II-5?

A)WW
B)Ww
C)ww
D)WW or ww
E)ww or Ww

Question 56

Use the following information to answer the questions below.
Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a ?white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant characteristic.
The flower colour trait in radishes is an example of which of the following?

A)a multiple allelic system
B)sex linkage
C)codominance
D)incomplete dominance
E)epistasis

Question 57

Use the following information to answer the questions below.
Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers and the other has white, terminal flowers; all F₁ individuals have red, axial flowers. The genes for flower colour and location assort independently.
Among the F₂ offspring, what is the probability of plants with white axial flowers?

A)9/16
B)1/16
C)3/16
D)1/8
E)1/4

Question 58

Use the following description and figure to answer the questions below.
In a particular plant, leaf colour is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding dark-leaved plant is crossed with a light-leaved one, and the F₁ offspring is allowed to self-pollinate. The predicted outcome of the F₂ is diagrammed in the Punnett square shown in Figure 14.1, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square.

Which of the boxes marked 1-4 correspond to plants with dark leaves?

A)1 only
B)1 and 2
C)2 and 3
D)4 only
E)1, 2, and 3

Question 59

Use the following information to answer the questions below.
Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers and the other has white, terminal flowers; all F₁ individuals have red, axial flowers. The genes for flower colour and location assort independently.
If 1000 F₂ offspring resulted from the cross, approximately how many of them would you expect to have red, terminal flowers?

A)65
B)190
C)250
D)565
E)750

Question 60

Use the following description and figure to answer the questions below.
In a particular plant, leaf colour is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding dark-leaved plant is crossed with a light-leaved one, and the F₁ offspring is allowed to self-pollinate. The predicted outcome of the F₂ is diagrammed in the Punnett square shown in Figure 14.1, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square.

Which of the boxes correspond to plants with a heterozygous genotype?

A)1
B)1 and 2
C)1, 2, and 3
D)2 and 3
E)2, 3, and 4

Question 61

Refer to the following information to answer the questions below.
Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. At the same time, a second gene, N, determines whether or not cacti have spines. Homozygous recessive nn cacti have no spines at all.
If doubly heterozygous SsNn cacti were allowed to self-pollinate, the F₂ would segregate in which of the following ratios?

A)3 sharp-spined:1 spineless
B)1 sharp-spined:2 dull-spined:1 spineless
C)1 sharp-spined:1 dull-spined:1 spineless
D)1 sharp-spined:1 dull-spined
E)9 sharp-spined:3 dull-spined:4 spineless

Question 62

Refer to the following information to answer the questions below.
Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. At the same time, a second gene, N, determines whether or not cacti have spines. Homozygous recessive nn cacti have no spines at all.
The relationship between genes S and N is an example of

A)incomplete dominance.
B)epistasis.
C)complete dominance.
D)pleiotropy.
E)codominance.

Question 63

Use the following information to answer the questions below.
Tallness (T) in snapdragons is dominant to dwarfness (t), while red (R) flower colour is dominant to white (r). The heterozygous condition results in pink (Rr) flower colour.
If snapdragons are heterozygous for height as well as for flower colour, a mating between them will result in what ratio?

A)9:3:3:1
B)6:3:3:2:1:1
C)1:2:1
D)27:9:9:9:3:3:3:1
E)9:4:3

Question 64

Use the following information to answer the questions below.
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N.
Which of the following is a possible genotype for the mother?

A)Iᴬᴵᴬ
B)Iᴮᴵᴮ
C)ii
D)Iᴬᶦ
E)Iᴬᴵᴮ

Question 65

Use the following information to answer the questions below.
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N.
Which of the following is a possible phenotype for the father?

A)A negative
B)O negative
C)B positive
D)AB negative
E)impossible to determine

Question 66

Use the following information to answer the questions below.
Tay-Sachs disease is an inherited genetic disorder in which the gene sequence codes for an enzyme involved in lipid metabolism. Accumulation of lipids in the brain leads to seizures, blindness, loss of neural function, and early death. People can be carriers of this disease and only homozygotic offspring will die from this disorder.
This is an example of

A)complete dominance.
B)co-dominance.
C)incomplete dominance.
D)pleitropy.
E)epistasis.

Question 67

Use the following information to answer the questions below.
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N.
Which of the following is a possible partial genotype for the son?

A)Iᴮᴵᴮ
B)IᴮᴵA
C)ii
D)Iᴮᶦ
E)Iᴬᴵᴬ

Question 68

If the environmental parameters, such as temperature, humidity, atmosphere, sunlight, and so on, are mostly Earthlike, which of the following do you expect of its types of leaves, stems, and flowers?

A)The genes for them would have originated on Earth.
B)Genes for these traits would have a common ancestor with those from Earth.
C)Such plants could be safely eaten by humans.
D)Genotypes for these traits would be identical to Earth plants with the same traits.
E)Phenotypes would be selected for or against by these environmental factors.

Question 69

Use the following information to answer the questions below.
Drosophila (fruit flies) usually have long wings (+) but mutations in two different genes can result in bent wings (bt) or vestigial wings (vg).
If a homozygous bent wing fly is mated with a homozygous vestigial wing fly, which of the following offspring would you expect?

A)all +bt +vg heterozygotes
B)1/2 bent and 1/2 vestigial flies
C)all homozygous + flies
D)3/4 bent to 1/4 vestigial ratio
E)1/2 bent and vestigial to 1/2 normal

Question 70

Use the information given here to answer the following questions.
Feather colour in budgies is determined by two different genes, Y and B, one for pigment on the outside and one for the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white.
Two blue budgies were crossed. Over the years, they produced 22 offspring, 5 of which were white. What are the most likely genotypes for the two blue budgies?

A)yyBB and yyBB
B)yyBB and yyBb
C)yyBb and yyBb
D)yyBB and yybb
E)yyBb and yybb

Question 71

Use the following information to answer the questions below.
Tallness (T) in snapdragons is dominant to dwarfness (t), while red (R) flower colour is dominant to white (r). The heterozygous condition results in pink (Rr) flower colour.
A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F₁ individuals?

A)ttRr-dwarf and pink
B)ttrr-dwarf and white
C)TtRr-tall and red
D)TtRr-tall and pink
E)TTRR-tall and red

Question 72

Use the following information to answer the questions below.
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N.
If both children are of blood type M, which of the following is possible?

A)Each parent is either M or MN.
B)Each parent must be type M.
C)Both children are heterozygous for this gene.
D)Neither parent can have the N allele.
E)The MN blood group is recessive to the ABO blood group.

Question 73

Refer to the following information to answer the questions below.
Humanoids on the newly explored planet Brin (in a hypothetical galaxy in ~50 years from the present) have a gene structure similar to our own, but many very different plants and animals.
One species of green plant, with frondlike leaves, a spine-coated stem, and purple cup-shaped flowers, is found to be self-pollinating. Which of the following is true of this species?

A)The species must be haploid.
B)Its reproduction is asexual.
C)All members of the species have the same genotype.
D)Some of the seeds would have true-breeding traits.
E)All of its dominant traits are most frequent.

Question 74

Use the information given here to answer the following questions.
Feather colour in budgies is determined by two different genes, Y and B, one for pigment on the outside and one for the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white.
A blue budgie is crossed with a white budgie. Which of the following results is not possible?

A)green offspring only
B)yellow offspring only
C)blue offspring only
D)green and yellow offspring
E)a 9:3:3:1 ratio

Question 75

Refer to the following information to answer the questions below.
Humanoids on the newly explored planet Brin (in a hypothetical galaxy in ~50 years from the present) have a gene structure similar to our own, but many very different plants and animals.
One species of a small birdlike animal has an extremely variable tail length, which is a highly polymorphic trait. Geneticists have come to realize that there are eight separate genes for tail length per haploid genome, with each gene having two alleles. One allele for each gene (a, b, and so on)increases the length by 1 cm, whereas the other allele (a₂, b₂, and so on)increases it by 0.5 cm. One bird was analyzed and found to have the following genotype: a₁a₁b₂b₂c₁c₂d₁d₂e₂e₂f₁f₂g₁g₁h₁h₂
What is the length of its tail?

A)6 cm
B)8 cm
C)12 cm
D)24 cm
E)36 cm

Question 76

Marfan syndrome in humans is caused by an abnormality of the connective tissue protein fibrillin. Patients are usually very tall and thin, with long spindly fingers, curvature of the spine, sometimes weakened arterial walls, and sometimes ocular problems, such as lens dislocation. Which of the following would you conclude about Marfan syndrome from this information?

A)It is recessive.
B)It is dominant.
C)It has a late age of onset (> 60).
D)It is pleiotropic.
E)It is epistatic.

Question 77

Use the following information to answer the questions below.
Drosophila (fruit flies) usually have long wings (+) but mutations in two different genes can result in bent wings (bt) or vestigial wings (vg).
If flies that are heterozygous for both the bent wing gene and the vestigial wing gene are mated, what is the probability of offspring with bent wings only?

A)1/8
B)3/8
C)1/4
D)9/16
E)3/16

Question 78

Refer to the following information to answer the questions below.
Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. At the same time, a second gene, N, determines whether or not cacti have spines. Homozygous recessive nn cacti have no spines at all.
A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce

A)all sharp-spined progeny.
B)50% sharp-spined, 50% dull-spined progeny.
C)25% sharp-spined, 50% dull-spined, 25% spineless progeny.
D)all spineless progeny.
E)It is impossible to determine the phenotypes of the progeny.

Question 79

Use the following information to answer the questions below.
Skin colour in a certain species of fish is inherited via a single gene with four different alleles.
One fish of this type has alleles 1 and 3 (S₁S₃)and its mate has alleles 2 and 4 (S₂S₄). If each allele confers a unit of colour darkness such that S₁ has one unit, S₂ has two units, and so on, then what proportion of their offspring would be expected to have five units of colour?

A)1/4
B)1/5
C)1/8
D)1/2
E)0

Question 80

Use the following information to answer the questions below.
Skin colour in a certain species of fish is inherited via a single gene with four different alleles.
How many different types of gametes would be possible in this system?

A)1
B)2
C)4
D)8
E)16