Question 1

Suppose your paternal grandmother has a rare mitochondrial mutation.It is likely that your father _______ (has / does not have) the mutation and that you do not have the mutation.

Accepted Answer

The answer of Suppose your paternal grandmother has a rare...

Question 2

One particular allele of a gene may be defined as _______, or standard, because it is present in most individuals and gives rise to an expected trait, or phenotype.

Accepted Answer

The answer of One particular allele of a gene may...

Question 3

A dominant allele (K) is necessary for normal hearing.A dominant allele (M) at a different, unlinked locus results in deafness no matter which other alleles are present.If a kkMm individual is crossed with a Kkmm individual, _______ percent of the offspring will be deaf.

Accepted Answer

A)  0 
B)  25 
C)  50 
D)  67 
E)  75

Question 4

Agouti is a type of coat color pattern in mice that cannot be expressed in albinos (white mice).A nonalbino agouti mouse that is heterozygous at the albino (A) and agouti (B) loci (AaBb) is mated to an albino mouse that is heterozygous at the agouti locus (aaBb).Nonalbino mice without the dominant agouti allele (AAbb and Aabb) are black.What percent of the progeny would you expect to be albino?

Accepted Answer

A)  0 percent 
B)  12.5 percent 
C)  37.5 percent 
D)  50 percent 
E)  100 percent

Question 5

The blue sclera allele has 75 percent penetrance for producing blue sclera, 60 percent penetrance for fragile bones, and 40 percent penetrance for deafness.If these probabilities of penetrance are independent, _______ percent of individuals with the blue sclera allele will have deafness, blue sclera, and normal bones.

Accepted Answer

The answer of The blue sclera allele has 75 percent...

Question 6

Genes A, B, C, D, and E are linked on the same chromosome.Locus A and locus B recombine with 10 percent frequency.Locus A and locus C recombine with 23 percent frequency.Locus B and locus D recombine with 4 percent frequency.Locus D and Locus E do not recombine.Based on this information, which of the pairs of loci are most likely to be closest together?

Accepted Answer

A)  A and B 
B)  A and C 
C)  B and D 
D)  D and E 
E)  They should all be equally distant.

Question 7

Curly wing is recessive to straight wing in Drosophila.If, in a cross between true-breeding curly-winged and straight-winged flies, there are 300 flies in the F₂ generation, _______ should have straight wings.

Accepted Answer

The answer of Curly wing is recessive to straight wing...

Question 8

Which number cannot be a value for a probability?

Accepted Answer

A)  0 
B)  0.56 
C)  0.794 
D)  0.96543 
E)  1.13

Question 9

Which statement about haploid organisms is true?

Accepted Answer

A)  They must be heterozygous for all genes. 
B)  They must be homozygous for all genes. 
C)  They can have only one allele for any particular gene. 
D)  They are missing a certain number of genes. 
E)  They have excess alleles for certain genes.

Question 10

What are the two most accepted hypotheses for hybrid vigor?

Accepted Answer

A)  Dominance and codominance 
B)  Dominance and overdominance 
C)  Dominance and pleiotropy 
D)  Codominance and overdominance 
E)  Codominance and pleiotropy

Question 11

A particular genetic cross in which an individual with a dominant phenotype and an unknown genotype is crossed with an individual known to be homozygous for a recessive trait is referred to as

Accepted Answer

A)  a parental cross. 
B)  a dihybrid cross. 
C)  filial generation mating. 
D)  a reciprocal cross. 
E)  a test cross.

Question 12

In a species of mice, short hair is dominant to long hair.If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that

Accepted Answer

A)  the short-haired individual is homozygous. 
B)  the long-haired individual is heterozygous. 
C)  the long-haired individual is homozygous. 
D)  the short-haired individual is heterozygous. 
E)  This cannot be answered without more information.

Question 13

Refer to the table.In Drosophila, white (w), eosin (we), and wild-type red (w+) are multiple alleles at a single locus for eye color.This locus is on the X chromosome.A female that has eosin (pale orange) eyes is crossed with a male that has wild-type (red) eyes.All the female progeny are red-eyed; about half the male progeny have eosin eyes, and about half have white eyes.Assume the female has two X chromosomes and the male has one X and one Y.  What is the order of dominance of these alleles?

Accepted Answer

A)  w > we > w+ 
B)  we > w > w+ 
C)  w+ > w > we 
D)  w > w+ > we 
E)  w+ > we > w

Question 14

Suppose that in a plant the smooth seed character (SS) is completely dominant over the wrinkled seed character (ss).If the characters for height are incompletely dominant-such that TT is tall, Tt is intermediate, and tt is short-what will result from crossing a smooth-seeded short plant (SStt) with a wrinkled-seeded tall plant (ssTT)?

Accepted Answer

A)  One-half will be smooth-seeded and intermediate in height; one-half will be smooth-seeded and tall. 
B)  All the progeny will be smooth-seeded and tall. 
C)  All the progeny will be smooth-seeded and short. 
D)  All the progeny will be smooth-seeded and intermediate in height. 
E)  This cannot be answered without more information.

Question 15

Geneticists make use of _______ frequencies to create genetic maps that show the position of genes on a chromosome.

Accepted Answer

The answer of Geneticists make use of _______ frequencies to...

Question 16

If the dominant allele A is necessary for hearing in humans, and another allele, B, located on a different chromosome, results in deafness no matter what other genes are present, what fraction of the offspring of the marriage of aaBb F1F1F1S1F1F1F10 Aabb will be deaf?

Accepted Answer

A)  none 
B)  1/8 
C)  1/4 
D)  1/2 
E)  5/8

Question 17

What fraction of offspring of the cross AaBb × AaBb would be homozygous for both the dominant alleles, assuming that they are on different chromosomes?

Accepted Answer

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

Question 18

In the genetic cross AaBbCcDdEE F1F1F1S1F1F1F10 AaBBCcDdEe, what fraction of the offspring will be heterozygous for all of these genes (AaBbCcDdEe)? Assume all genes are unlinked.

Accepted Answer

A)  1/32 
B)  1/16 
C)  3/32 
D)  1/4 
E)  5/32

Question 19

Compare the closely related concepts of penetrance and expressivity.

Accepted Answer

The answer of Compare the closely related concepts of penetrance...

Question 20

Segregation of alleles occurs

Accepted Answer

A)  during meiosis. 
B)  at fertilization. 
C)  during mitosis. 
D)  during the random combination of gametes to produce the F2 generation. 
E)  only in monohybrid crosses.

Exam 12: Inheritance, Genes, and Chromosomes

Suppose your paternal grandmother has a rare mitochondrial mutation.It is likely that your father _______ (has / does not have) the mutation and that you do not have the mutation.

One particular allele of a gene may be defined as _______, or standard, because it is present in most individuals and gives rise to an expected trait, or phenotype.

A dominant allele (K) is necessary for normal hearing.A dominant allele (M) at a different, unlinked locus results in deafness no matter which other alleles are present.If a kkMm individual is crossed with a Kkmm individual, _______ percent of the offspring will be deaf.

Curly wing is recessive to straight wing in Drosophila.If, in a cross between true-breeding curly-winged and straight-winged flies, there are 300 flies in the F₂ generation, _______ should have straight wings.

Which number cannot be a value for a probability?

Which statement about haploid organisms is true?

What are the two most accepted hypotheses for hybrid vigor?

A particular genetic cross in which an individual with a dominant phenotype and an unknown genotype is crossed with an individual known to be homozygous for a recessive trait is referred to as

In a species of mice, short hair is dominant to long hair.If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that

Geneticists make use of _______ frequencies to create genetic maps that show the position of genes on a chromosome.

If the dominant allele A is necessary for hearing in humans, and another allele, B, located on a different chromosome, results in deafness no matter what other genes are present, what fraction of the offspring of the marriage of aaBb  Aabb will be deaf?

What fraction of offspring of the cross AaBb × AaBb would be homozygous for both the dominant alleles, assuming that they are on different chromosomes?

In the genetic cross AaBbCcDdEE  AaBBCcDdEe, what fraction of the offspring will be heterozygous for all of these genes (AaBbCcDdEe) ? Assume all genes are unlinked.

Compare the closely related concepts of penetrance and expressivity.

Segregation of alleles occurs

Exam 12: Inheritance, Genes, and Chromosomes

Suppose your paternal grandmother has a rare mitochondrial mutation.It is likely that your father _______ (has / does not have) the mutation and that you do not have the mutation.

One particular allele of a gene may be defined as _______, or standard, because it is present in most individuals and gives rise to an expected trait, or phenotype.

A dominant allele (K) is necessary for normal hearing.A dominant allele (M) at a different, unlinked locus results in deafness no matter which other alleles are present.If a kkMm individual is crossed with a Kkmm individual, _______ percent of the offspring will be deaf.

Curly wing is recessive to straight wing in Drosophila.If, in a cross between true-breeding curly-winged and straight-winged flies, there are 300 flies in the F2 generation, _______ should have straight wings.

Which number cannot be a value for a probability?

Which statement about haploid organisms is true?

What are the two most accepted hypotheses for hybrid vigor?

A particular genetic cross in which an individual with a dominant phenotype and an unknown genotype is crossed with an individual known to be homozygous for a recessive trait is referred to as

In a species of mice, short hair is dominant to long hair.If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that

Geneticists make use of _______ frequencies to create genetic maps that show the position of genes on a chromosome.

If the dominant allele A is necessary for hearing in humans, and another allele, B, located on a different chromosome, results in deafness no matter what other genes are present, what fraction of the offspring of the marriage of aaBb  Aabb will be deaf?

What fraction of offspring of the cross AaBb × AaBb would be homozygous for both the dominant alleles, assuming that they are on different chromosomes?

In the genetic cross AaBbCcDdEE  AaBBCcDdEe, what fraction of the offspring will be heterozygous for all of these genes (AaBbCcDdEe) ? Assume all genes are unlinked.

Compare the closely related concepts of penetrance and expressivity.

Segregation of alleles occurs

Curly wing is recessive to straight wing in Drosophila.If, in a cross between true-breeding curly-winged and straight-winged flies, there are 300 flies in the F₂ generation, _______ should have straight wings.