Question 1

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R=round,r=wrinkled,Y=yellow,y=green

Accepted Answer

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

Question 2

If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation,the counselor would assume that the disease was caused by

Accepted Answer

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

Question 3

If you cross two pea plants,one with green peas and the other with yellow peas,and all of the offspring have yellow peas,you conclude

Accepted Answer

A)  the yellow parent was homozygous for the recessive allele. 
B)  the green parent was homozygous for the dominant allele. 
C)  the yellow parent was homozygous for the dominant allele. 
D)  the green parent was heterozygous. 
E)  the yellow parent was heterozygous. 
A)  the yellow parent was homozygous for the recessive allele. 
B)  the green parent was homozygous for the dominant allele. 
C)  the yellow parent was homozygous for the dominant allele. 
D)  the green parent was heterozygous. 
E)  the yellow parent was heterozygous.

Question 4

A single chromosome has

Accepted Answer

A)  multiple genes each with a single allele. 
B)  multiple genes each with multiple alleles. 
C)  a single gene with a single allele. 
D)  a single gene with multiple alleles. 
E)  No answer is correct. 
A)  multiple genes each with a single allele. 
B)  multiple genes each with multiple alleles. 
C)  a single gene with a single allele. 
D)  a single gene with multiple alleles. 
E)  No answer is correct.

Question 5

If X inactivation fails,problems will result because protein production for sex-linked genes will be too great.

Accepted Answer

A) True 
 B)False

Question 6

Average heights of American men and women have increased steadily since the 1940s.The best explanation for this observation is that height is

Accepted Answer

A)  a polygenic trait. 
B)  influenced by an X-linked gene. 
C)  influenced by environmental changes like improvements in diet. 
D)  influenced by a Y-linked gene. 
E)  influenced by crossing over. 
A)  a polygenic trait. 
B)  influenced by an X-linked gene. 
C)  influenced by environmental changes like improvements in diet. 
D)  influenced by a Y-linked gene. 
E)  influenced by crossing over.

Question 7

Mendel called a masking trait

Accepted Answer

A)  dominant. 
B)  recessive. 
C)  homologous. 
D)  homozygous. 
E)  heterozygous. 
A)  dominant. 
B)  recessive. 
C)  homologous. 
D)  homozygous. 
E)  heterozygous.

Question 8

A person has a recessive,faulty allele for a disease,but the person does not have the disease since they also have a normal dominant allele.This person

Accepted Answer

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

Question 9

A man with type A blood and a woman with type B blood have a child with type O blood.What are the genotypes of the man and woman?

Accepted Answer

A)  Iᴬ ᶦ, and Iᴮ ᶦ 
B)  both are i i 
C)  Iᴬ ᴵᴬ, and Iᴮ ᴵᴮ 
D)  Iᴬ ᶦ, and i i 
E)  i i, and Iᴮ ᶦ 
A)  Iᴬ ᶦ, and Iᴮ ᶦ 
B)  both are i i 
C)  Iᴬ ᴵᴬ, and Iᴮ ᴵᴮ 
D)  Iᴬ ᶦ, and i i 
E)  i i, and Iᴮ ᶦ

Question 10

Hemophilia A is an X-linked recessive disorder.What is the probability that a son will have hemophilia if the parents are a normal man and a woman who is a carrier?

Accepted Answer

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

Question 11

The chromosome that has the genes that determine whether a human is male or female is

Accepted Answer

A)  the X chromosome. 
B)  chromosome number 21. 
C)  the group of autosomes known as the SRY group. 
D)  chromosome number 22. 
E)  the Y chromosome. 
A)  the X chromosome. 
B)  chromosome number 21. 
C)  the group of autosomes known as the SRY group. 
D)  chromosome number 22. 
E)  the Y chromosome.

Question 12

An allele that exerts its effects whenever it is present is

Accepted Answer

A)  recessive. 
B)  dominant. 
C)  homologous. 
D)  homozygous. 
E)  heterozygous. 
A)  recessive. 
B)  dominant. 
C)  homologous. 
D)  homozygous. 
E)  heterozygous.

Question 13

A gene that has alleles for blue,pink,red,and white flowers is pleiotropic.

Accepted Answer

A) True 
 B)False

Question 14

A dihybrid cross would be a mating between two individuals that are both

Accepted Answer

A)  homozygous recessive for one gene. 
B)  homozygous dominant for two genes. 
C)  homozygous recessive for two genes. 
D)  heterozygous for one gene. 
E)  heterozygous for two genes. 
A)  homozygous recessive for one gene. 
B)  homozygous dominant for two genes. 
C)  homozygous recessive for two genes. 
D)  heterozygous for one gene. 
E)  heterozygous for two genes.

Exam 10: Patterns of Inheritance

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R=round,r=wrinkled,Y=yellow,y=green

If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation,the counselor would assume that the disease was caused by

If you cross two pea plants,one with green peas and the other with yellow peas,and all of the offspring have yellow peas,you conclude

A single chromosome has

If X inactivation fails,problems will result because protein production for sex-linked genes will be too great.

Average heights of American men and women have increased steadily since the 1940s.The best explanation for this observation is that height is

Mendel called a masking trait

A person has a recessive,faulty allele for a disease,but the person does not have the disease since they also have a normal dominant allele.This person

A man with type A blood and a woman with type B blood have a child with type O blood.What are the genotypes of the man and woman?

Hemophilia A is an X-linked recessive disorder.What is the probability that a son will have hemophilia if the parents are a normal man and a woman who is a carrier?

The chromosome that has the genes that determine whether a human is male or female is

An allele that exerts its effects whenever it is present is

A gene that has alleles for blue,pink,red,and white flowers is pleiotropic.

A dihybrid cross would be a mating between two individuals that are both

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