Question 1

Of all the people who have studied inheritance,the person who made the earliest foundational study in the science of genetics is

Accepted Answer

A)  Charles Darwin. 
B)  Gregor Mendel. 
C)  Robert Hooke. 
D)  Frederick Griffith. 
E)  King George III. 
A)  Charles Darwin. 
B)  Gregor Mendel. 
C)  Robert Hooke. 
D)  Frederick Griffith. 
E)  King George III.

Question 2

Diagrams depicting family relationships and phenotypes for a genetic disorder are

Accepted Answer

A)  bell-shaped curves. 
B)  linkage maps. 
C)  karyotypes. 
D)  pedigree charts. 
E)  Punnett squares. 
A)  bell-shaped curves. 
B)  linkage maps. 
C)  karyotypes. 
D)  pedigree charts. 
E)  Punnett squares.

Question 3

In animals,each gamete arises from a diploid cell containing two sets of homologous chromosomes.

Accepted Answer

A) True 
 B)False

Question 4

If a person has a recessive allele for a disorder and that allele is masked by presence of a normal dominant allele,this person

Accepted Answer

A)  is termed a carrier. 
B)  has the disease but cannot pass this disease to their offspring. 
C)  is homozygous for the disease. 
D)  is termed a linkage group. 
E)  cannot produce gametes. 
A)  is termed a carrier. 
B)  has the disease but cannot pass this disease to their offspring. 
C)  is homozygous for the disease. 
D)  is termed a linkage group. 
E)  cannot produce gametes.

Question 5

Figuer:
In these data, the parental generation characteristics (resistant or susceptible) are shown at top.  
-In this figure,the genotype of the resistant parental bollworms is ___ while the susceptible parental bollworms have a ___ genotype.

Accepted Answer

A)  rr; RR 
B)  Rr; rr 
C)  RR; rr 
D)  RR; Rr 
E)  Rr; RR 
A)  rr; RR 
B)  Rr; rr 
C)  RR; rr 
D)  RR; Rr 
E)  Rr; RR

Question 6

In the ABO blood type system,there are six possible genotypes,but only two possible phenotypes.

Accepted Answer

A) True 
 B)False

Question 7

At a given position,homologous chromosomes have

Accepted Answer

A)  the same genes but can have different alleles. 
B)  the same genes and alleles. 
C)  different genes and alleles. 
D)  different genes, but can have the same alleles. 
A)  the same genes but can have different alleles. 
B)  the same genes and alleles. 
C)  different genes and alleles. 
D)  different genes, but can have the same alleles.

Question 8

Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes.

Accepted Answer

A) True 
 B)False

Question 9

Phenotype means

Accepted Answer

A)  the number of chromosomes in an individual. 
B)  the genes an individual has. 
C)  the combination of alleles in an individual. 
D)  the observable expression of the genes in an individual. 
E)  the number of gametes in an individual. 
A)  the number of chromosomes in an individual. 
B)  the genes an individual has. 
C)  the combination of alleles in an individual. 
D)  the observable expression of the genes in an individual. 
E)  the number of gametes in an individual.

Question 10

You mate two pea plants that are both AaBb and get a 3:1 phenotype ratio.This suggests

Accepted Answer

A)  independent assortment occurred. 
B)  crossing over occurred. 
C)  genes A and B are linked on the same chromosome. 
D)  nondisjunction occurred. 
E)  genes A and B are on different chromosomes. 
A)  independent assortment occurred. 
B)  crossing over occurred. 
C)  genes A and B are linked on the same chromosome. 
D)  nondisjunction occurred. 
E)  genes A and B are on different chromosomes.

Question 11

The "P" in P generation refers to

Accepted Answer

A)  potential offspring. 
B)  parental. 
C)  pure breeding. 
D)  All of the answer choices are correct. 
E)  the recessive allele. 
A)  potential offspring. 
B)  parental. 
C)  pure breeding. 
D)  All of the answer choices are correct. 
E)  the recessive allele.

Question 12

You are studying genes in yeast and find that the genes can be placed into four groups that tend to be inherited together.From this you can conclude that yeast

Accepted Answer

A)  produce four cells during meiosis. 
B)  have four loci. 
C)  have four genes. 
D)  have four chromosomes. 
E)  have four alleles. 
A)  produce four cells during meiosis. 
B)  have four loci. 
C)  have four genes. 
D)  have four chromosomes. 
E)  have four alleles.

Question 13

The wide variation in skin color in humans is best explained by

Accepted Answer

A)  artificial selection. 
B)  skin color is a polygenic trait. 
C)  crossing over. 
D)  genetic drift. 
E)  environmental changes like improvements in diet. 
A)  artificial selection. 
B)  skin color is a polygenic trait. 
C)  crossing over. 
D)  genetic drift. 
E)  environmental changes like improvements in diet.

Question 14

Figuer:
In these data, the parental generation characteristics (resistant or susceptible) are shown at top.  
-In this figure,the F1 generation shows mating of resistant bollworms (___)with susceptible heterozygous (____)bollworms.

Accepted Answer

A)  Rr; RR 
B)  RR; rr 
C)  rr; Rr 
D)  Rr; rr 
E)  rr; RR 
A)  Rr; RR 
B)  RR; rr 
C)  rr; Rr 
D)  Rr; rr 
E)  rr; RR

Question 15

A monohybrid cross is a mating between two individuals that are both

Accepted Answer

A)  None of the answer choices are correct. 
B)  homozygous for one gene. 
C)  heterozygous for two genes. 
D)  heterozygous for one gene. 
E)  homozygous for two genes. 
A)  None of the answer choices are correct. 
B)  homozygous for one gene. 
C)  heterozygous for two genes. 
D)  heterozygous for one gene. 
E)  homozygous for two genes.

Question 16

Hemophilia A is an X-linked recessive disorder.If a normal man marries a woman who is a carrier,what fraction of their sons will have hemophilia?

Accepted Answer

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

Question 17

Genetic counselors are more commonly available for diagnosing some diseases,and for helping in family planning.If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation,she has strong evidence that the disease is caused by

Accepted Answer

A)  a new reoccurring mutation. 
B)  an autosomal recessive disorder. 
C)  an autosomal dominant disorder. 
D)  a chromosomal abnormality. 
E)  having an extra set of chromosomes. 
A)  a new reoccurring mutation. 
B)  an autosomal recessive disorder. 
C)  an autosomal dominant disorder. 
D)  a chromosomal abnormality. 
E)  having an extra set of chromosomes.

Question 18

The most common phenotype or allele for a gene in a population is referred to as the

Accepted Answer

A)  dominant population. 
B)  F1 generation. 
C)  recessive population. 
D)  P generation. 
E)  wild-type. 
A)  dominant population. 
B)  F1 generation. 
C)  recessive population. 
D)  P generation. 
E)  wild-type.

Question 19

If any of the traits that Mendel worked with had been due to linked genes,his dihybrid crosses would have

Accepted Answer

A)  had different results. 
B)  exhibited a typical phenotypic ratio of 9:3:3:1. 
C)  produced more offspring. 
D)  produced sterile offspring. 
E)  produced less offspring. 
A)  had different results. 
B)  exhibited a typical phenotypic ratio of 9:3:3:1. 
C)  produced more offspring. 
D)  produced sterile offspring. 
E)  produced less offspring.

Question 20

In biology lab,your class counts the number of people with different colors of hair and eyes.Your instructor says that these traits are variable and difficult to trace in each family.The reason is that these two traits depend on more than one gene,and are called

Accepted Answer

A)  codominant. 
B)  incomplete dominant traits. 
C)  pleiotropic. 
D)  recessive. 
E)  polygenic. 
A)  codominant. 
B)  incomplete dominant traits. 
C)  pleiotropic. 
D)  recessive. 
E)  polygenic.

Exam 10: Patterns of Inheritance

Of all the people who have studied inheritance,the person who made the earliest foundational study in the science of genetics is

Diagrams depicting family relationships and phenotypes for a genetic disorder are

In animals,each gamete arises from a diploid cell containing two sets of homologous chromosomes.

If a person has a recessive allele for a disorder and that allele is masked by presence of a normal dominant allele,this person

Figuer: In these data, the parental generation characteristics (resistant or susceptible) are shown at top. -In this figure,the genotype of the resistant parental bollworms is ___ while the susceptible parental bollworms have a ___ genotype.

In the ABO blood type system,there are six possible genotypes,but only two possible phenotypes.

At a given position,homologous chromosomes have

Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes.

Phenotype means

You mate two pea plants that are both AaBb and get a 3:1 phenotype ratio.This suggests

The "P" in P generation refers to

You are studying genes in yeast and find that the genes can be placed into four groups that tend to be inherited together.From this you can conclude that yeast

The wide variation in skin color in humans is best explained by

Figuer: In these data, the parental generation characteristics (resistant or susceptible) are shown at top. -In this figure,the F1 generation shows mating of resistant bollworms (___)with susceptible heterozygous (____)bollworms.

A monohybrid cross is a mating between two individuals that are both

Hemophilia A is an X-linked recessive disorder.If a normal man marries a woman who is a carrier,what fraction of their sons will have hemophilia?

Genetic counselors are more commonly available for diagnosing some diseases,and for helping in family planning.If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation,she has strong evidence that the disease is caused by

The most common phenotype or allele for a gene in a population is referred to as the

If any of the traits that Mendel worked with had been due to linked genes,his dihybrid crosses would have

In biology lab,your class counts the number of people with different colors of hair and eyes.Your instructor says that these traits are variable and difficult to trace in each family.The reason is that these two traits depend on more than one gene,and are called

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Figuer: In these data, the parental generation characteristics (resistant or susceptible) are shown at top. -In this figure,the genotype of the resistant parental bollworms is _ while the susceptible parental bollworms have a _ genotype.

Figuer: In these data, the parental generation characteristics (resistant or susceptible) are shown at top. -In this figure,the F₁ generation shows mating of resistant bollworms (_)with susceptible heterozygous (__)bollworms.