Question 1

What is the inheritance pattern of Duchenne muscular dystrophy?

Accepted Answer

A)  sex-linked recessive 
B)  sex-linked dominant 
C)  codominance 
D)  pleiotropic 
E)  polygenic inheritance 
A)  sex-linked recessive 
B)  sex-linked dominant 
C)  codominance 
D)  pleiotropic 
E)  polygenic inheritance

Question 2

Matt breeds and sells snakes. He knows that he can make the most money by breeding and selling albino snakes. Albinism is a recessive trait. His female albino corn snake just produced six offspring. Two displayed normal coloration and four were albino. What do you know about the genotype of the father?

Accepted Answer

A)  He must be homozygous dominant. 
B)  He must be heterozygous. 
C)  He must be homozygous recessive. 
D)  He could be either heterozygous or homozygous dominant. 
E)  There is not enough information to determine the father's genotype. 
A)  He must be homozygous dominant. 
B)  He must be heterozygous. 
C)  He must be homozygous recessive. 
D)  He could be either heterozygous or homozygous dominant. 
E)  There is not enough information to determine the father's genotype.

Question 3

Which of the following is mismatched?

Accepted Answer

A)  physical expression of a trait - phenotype 
B)  allele that masks expression of alternate allele - dominant 
C)  identical alleles - heterozygous 
D)  allele whose expression can be masked by an alternate allele - recessive 
E)  the specific alleles that an individual has - genotype 
A)  physical expression of a trait - phenotype 
B)  allele that masks expression of alternate allele - dominant 
C)  identical alleles - heterozygous 
D)  allele whose expression can be masked by an alternate allele - recessive 
E)  the specific alleles that an individual has - genotype

Question 4

A heterozygote for a trait exhibiting incomplete dominance will

Accepted Answer

A)  express the dominant trait. 
B)  express the recessive trait. 
C)  exhibit an intermediate phenotype. 
D)  express both alleles. 
E)  exhibit an intermediate genotype. 
A)  express the dominant trait. 
B)  express the recessive trait. 
C)  exhibit an intermediate phenotype. 
D)  express both alleles. 
E)  exhibit an intermediate genotype.

Question 5

In fruit flys, long-wings (L) is dominant to short-wings (l) and a gray body color (G) is dominant to black body color (b). A long-winged Drosophila female with a gray body mates with a black, short-winged male fly (llgg). The phenotypic ratio of the offspring is 1:1:1:1. What is the genotype of the female fly?

Accepted Answer

A)  LlGg 
B)  LLGG 
C)  llgg 
D)  LLgg 
E)  llGG 
A)  LlGg 
B)  LLGG 
C)  llgg 
D)  LLgg 
E)  llGG

Question 6

In fruit flies, red-eyes are dominant to white-eyes. In addition, eye color is a sex-linked trait. If a homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila. What proportion of the female offspring will have white eyes?

Accepted Answer

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

Question 7

A cow with black and white patches is produced from a white bull and a black cow. This is an example of

Accepted Answer

A)  incomplete dominance. 
B)  codominance. 
C)  dominance/recessive trait. 
D)  polygenic. 
E)  pleiotropy. 
A)  incomplete dominance. 
B)  codominance. 
C)  dominance/recessive trait. 
D)  polygenic. 
E)  pleiotropy.

Question 8

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

Accepted Answer

A)  phenylketonuria (PKU) 
B)  Marfan syndrome 
C)  Huntington disease 
D)  sickle-cell disease 
E)  cystic fibrosis (CF) 
A)  phenylketonuria (PKU) 
B)  Marfan syndrome 
C)  Huntington disease 
D)  sickle-cell disease 
E)  cystic fibrosis (CF)

Question 9

If a heterozygous dominant tall pea plant is crossed with a short pea plant, what is the expected phenotypic ratio?

Accepted Answer

A)  1 tall:1 short 
B)  1 tall:2 short 
C)  3 tall:1 short 
D)  all tall 
E)  all short 
A)  1 tall:1 short 
B)  1 tall:2 short 
C)  3 tall:1 short 
D)  all tall 
E)  all short

Question 10

Red-green color blindness is a recessive X-linked trait. If a female is red-green color-blind, which of the following is true?

Accepted Answer

A)  Her mother must be color-blind. 
B)  Both her parents must be color-blind. 
C)  Both her parents are carriers of the recessive allele. 
D)  Her father must be color-blind. 
E)  Women cannot exhibit red-green color blindness because they have two X chromosomes. 
A)  Her mother must be color-blind. 
B)  Both her parents must be color-blind. 
C)  Both her parents are carriers of the recessive allele. 
D)  Her father must be color-blind. 
E)  Women cannot exhibit red-green color blindness because they have two X chromosomes.

Question 11

Which of the following is a sex-linked recessive disorder?

Accepted Answer

A)  color blindness 
B)  Marfan syndrome 
C)  sickle-cell disease 
D)  cystic fibrosis 
E)  alkaptonuria 
A)  color blindness 
B)  Marfan syndrome 
C)  sickle-cell disease 
D)  cystic fibrosis 
E)  alkaptonuria

Question 12

Which of the following is an example of a phenotype?

Accepted Answer

A)  AAGg 
B)  freckles 
C)  AA 
D)  Ag 
E)  Gg 
A)  AAGg 
B)  freckles 
C)  AA 
D)  Ag 
E)  Gg

Question 13

The filled-in squares of a Punnett square represent

Accepted Answer

A)  the gametes from both parents. 
B)  all possible combinations of gametes based on a cross between the two parents. 
C)  an exact ratio that must always occur when the same parents have four offspring. 
D)  examples of some of the offspring that can arise from a one-trait cross. 
E)  the gametes from one parent. 
A)  the gametes from both parents. 
B)  all possible combinations of gametes based on a cross between the two parents. 
C)  an exact ratio that must always occur when the same parents have four offspring. 
D)  examples of some of the offspring that can arise from a one-trait cross. 
E)  the gametes from one parent.

Question 14

A woman with type AB blood marries a man who is heterozygous for type B blood. If they have children, what are all the possible blood types for the children?

Accepted Answer

A)  AB only 
B)  AB, AA, AO, and BO 
C)  AB, BB, AO, and BO 
D)  BB only 
E)  AA, BB, and AB 
A)  AB only 
B)  AB, AA, AO, and BO 
C)  AB, BB, AO, and BO 
D)  BB only 
E)  AA, BB, and AB

Question 15

A male is always homozygous for a trait that is

Accepted Answer

A)  codominant. 
B)  X-linked. 
C)  autosomal. 
D)  dominant. 
E)  dihybrid. 
A)  codominant. 
B)  X-linked. 
C)  autosomal. 
D)  dominant. 
E)  dihybrid.

Question 16

Which of the following is an autosomal dominant disorder?

Accepted Answer

A)  Huntington's disease 
B)  sickle-cell disease 
C)  alkaptonuria 
D)  cystic fibrosis 
E)  methemoglobinemia 
A)  Huntington's disease 
B)  sickle-cell disease 
C)  alkaptonuria 
D)  cystic fibrosis 
E)  methemoglobinemia

Question 17

What is the inheritance pattern of hemophila?

Accepted Answer

A)  sex-linked recessive 
B)  sex-linked dominant 
C)  codominance 
D)  polygenic 
E)  pleiotropic 
A)  sex-linked recessive 
B)  sex-linked dominant 
C)  codominance 
D)  polygenic 
E)  pleiotropic

Question 18

Determine if the following statement is true or false. A man with blood type A and a woman with blood type B can have a baby with blood type O.

Accepted Answer

A)  True, because although A and B are the dominant blood types, both individuals could carry a type O allele. 
B)  False, the child must have type AB blood. 
C)  True, because A and B are codominant. 
D)  False, because type A and B are dominant blood types and these individuals cannot have offspring with the recessive blood type. 
E)  True, because only one O allele is needed. 
A)  True, because although A and B are the dominant blood types, both individuals could carry a type O allele. 
B)  False, the child must have type AB blood. 
C)  True, because A and B are codominant. 
D)  False, because type A and B are dominant blood types and these individuals cannot have offspring with the recessive blood type. 
E)  True, because only one O allele is needed.

Question 19

Hydrangeas are a flowering plant with large showy blooms. When a plant is grown in acidic soil, it has blue flowers; if the same plant is transplanted into soil that is alkaline, the flowers produced will be pink. This is an example of

Accepted Answer

A)  environmental influence. 
B)  codominance. 
C)  incomplete dominance. 
D)  polygenetic inheritance. 
E)  monohybrid inheritance. 
A)  environmental influence. 
B)  codominance. 
C)  incomplete dominance. 
D)  polygenetic inheritance. 
E)  monohybrid inheritance.

Question 20

People who suffer fromMarfan syndrome have disproportionately long limbs, a weakened aorta, and poor eyesight. All of these characteristics are due to the production of abnormal connective tissue, resulting from a single defective gene. Marfan syndrome is an example of

Accepted Answer

A)  pleiotropy. 
B)  polygenic inheritance. 
C)  multiple allelism. 
D)  epistasis. 
E)  codominance. 
A)  pleiotropy. 
B)  polygenic inheritance. 
C)  multiple allelism. 
D)  epistasis. 
E)  codominance.

Exam 10: Patterns of Inheritance

What is the inheritance pattern of Duchenne muscular dystrophy?

Which of the following is mismatched?

A heterozygote for a trait exhibiting incomplete dominance will

In fruit flies, red-eyes are dominant to white-eyes. In addition, eye color is a sex-linked trait. If a homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila. What proportion of the female offspring will have white eyes?

A cow with black and white patches is produced from a white bull and a black cow. This is an example of

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

If a heterozygous dominant tall pea plant is crossed with a short pea plant, what is the expected phenotypic ratio?

Red-green color blindness is a recessive X-linked trait. If a female is red-green color-blind, which of the following is true?

Which of the following is a sex-linked recessive disorder?

Which of the following is an example of a phenotype?

The filled-in squares of a Punnett square represent

A woman with type AB blood marries a man who is heterozygous for type B blood. If they have children, what are all the possible blood types for the children?

A male is always homozygous for a trait that is

Which of the following is an autosomal dominant disorder?

What is the inheritance pattern of hemophila?

Determine if the following statement is true or false. A man with blood type A and a woman with blood type B can have a baby with blood type O.

Hydrangeas are a flowering plant with large showy blooms. When a plant is grown in acidic soil, it has blue flowers; if the same plant is transplanted into soil that is alkaline, the flowers produced will be pink. This is an example of

People who suffer fromMarfan syndrome have disproportionately long limbs, a weakened aorta, and poor eyesight. All of these characteristics are due to the production of abnormal connective tissue, resulting from a single defective gene. Marfan syndrome is an example of

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