Question 1

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 baby snakes with the normal coloration?

Accepted Answer

A)   They must be homozygous dominant.
B)   They must be homozygous recessive.
C)   They must be heterozygous.
D)   They could be either heterozygous or homozygous dominant.
E)   There is not enough information to determine their genotype, but we know that they must carry the dominant allele.F) A) and C)
G) A) and B)

Question 2

A couple has three children, two of which have blonde hair. The third child and both parents have dark hair. What can be determined about the gene for hair color in this family?

Accepted Answer

A)   Blonde hair color is an autosomal recessive trait.
B)   Blonde hair color is an autosomal dominant trait.
C)   Blonde hair color is a sex-linked dominant trait.
D)   Blonde hair coloris a sex-linked recessive trait.
E)   Blonde hair colorconveys a lethal mutation.F) A) and B)
G) A) and C)

Question 3

Alleles that are linked on the same chromosome will always assort independently during meiosis.

Accepted Answer

A) True 
 B)False

Question 4

On one chromosome, the allele for white eyes is located at loci 12 and the allele for a hairy body is located at loci 16. On a second chromosome, the allele for red eyes is located at loci 15 and the allele for a normal body is located at loci 17. Which allele combination has the greater map distance?

Accepted Answer

A)   white eyes and hairy body
B)   white eyes and normal body
C)   red eyes and normal body
D)   red eyes and hairy body
E)   white eyes and red eyesF) B) and E)
G) A) and B)

Question 5

Hunter syndrome is a rare genetic disorder in which large sugar molecules called glycosaminoglycans build up in body tissues. Hunter syndrome causes abnormalities in many organs, including the skeleton, heart, and respiratory system. In severe cases, this leads to death during the teenage years. Hunter syndrome is caused by a recessive gene on the X chromosome. If a woman who is normal (but had a father with the disease)  marries a normal man, what are the chances of having a daughter affected by the disease?

Accepted Answer

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

Question 6

Alleles are

Accepted Answer

A)   dominant genes.
B)   recessive genes.
C)   two versions of the same gene.
D)   alternate versions of the same gene.
E)   sister chromatids.F) None of the above
G) A) and B)

Question 7

Which of the following is true in regards to an autosomal recessive pedigree?

Accepted Answer

A)   Heterozygotes have a normal phenotype.
B)   Affected children will have at least one affected parent.
C)   Heterozygotes are affected.
D)   Males are affected more often than females.
E)   The trait is carried on the Y chromosome.F) B) and C)
G) B) and D)

Question 8

If a homozygous black bull is mated with a homozygous white cow and the calf is gray, this would be an example of ________. However, if the calf has black and white spots, this would be an example of________.

Accepted Answer

A)   incomplete dominance; a sex-linked trait
B)   complete dominance; polygenic trait
C)   codominance; homology
D)   incomplete dominance; codominance
E)   a sex-linked trait; a recessive traitF) All of the above
G) None of the above

Question 9

Sickle-cell disease is caused by a single mutation in the DNA of a particular gene. A person with this disease has red blood cells that lose their original donut shape and form a sickle shape. People with this disorder suffer from low energy levels, blood clots, and strokes. This is an example of

Accepted Answer

A)   a multifactorial trait.
B)   polygenic inheritance.
C)   pleiotropy.
D)   codominance.
E)   incomplete dominance.F) A) and E)
G) B) and E)

Question 10

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 is the chance that another offspring produced by the same parents will be albino?

Accepted Answer

A)   0%
B)   25%
C)   50%
D)   75%
E)   100%F) C) and E)
G) All of the above

Question 11

If both parents express a particular trait, but their child does not, what does this indicate about the trait?

Accepted Answer

A)   The trait is an autosomal dominant trait.
B)   The trait is an autosomal recessive trait.
C)   The trait is sex-linked recessive.
D)   The trait is sex-linked dominant.
E)   This is a lethal trait.F) C) and D)
G) C) and E)

Question 12

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of histraits. If blue eyes and left-handedness are recessive, how many different phenotypes are possible in their children?

Accepted Answer

A)   four
B)   three
C)   two
D)   one
E)   fiveF) A) and E)
G) B) and D)

Question 13

What does true-breeding mean?

Accepted Answer

A)   When the plant is pollinated, all the offspring resemble the parent and are heterozygotes.
B)   The organism can be cross-pollinated.
C)   When the plant self-pollinates, all the offspring resemble the parent, and arehomozygous for that gene.
D)   The organism is easy to cultivate.
E)   The organism cannot be cultivated.F) B) and C)
G) All of the above

Question 14

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

Accepted Answer

A)   0%
B)   25%
C)   50%
D)   75%
E)   100%F) None of the above
G) B) and C)

Question 15

Which of the following is mismatched?

Accepted Answer

A)   physical expression of a trait - phenotype
B)   allele that masks the expression of an 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 - genotypeF) B) and D)
G) A) and D)

Question 16

Primroses have white flowers when grown above 32°C but red flowers when grown at 24°C. This interaction between phenotypic expression and environment is an example of

Accepted Answer

A)   epistasis.
B)   polygenictraits.
C)   pleiotropy.
D)   environmental influence.
E)   codominance.F) B) and E)
G) A) and D) D

Question 17

Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of

Accepted Answer

A)   a multifactorial trait.
B)   polygenic inheritance.
C)   pleiotropy.
D)   codominance.
E)   incomplete dominance.F) D) and E)
G) B) and E)

Question 18

Cold weather can change what aspect of a Himalayan rabbit?

Accepted Answer

A)   phenotype
B)   genotype
C)   alleles
D)   sex
E)   rate of genetic mutationsF) None of the above
G) A) and B) A

Question 19

Which of the following is an inaccurate statement about human blood types?

Accepted Answer

A)   I A represents antigen A on red blood cells.
B)   A person with AB blood has two different antigens on their red blood cells.
C)   The allele representing blood type O is recessive.
D)   Human blood genetics involves multiple alleles and an individual can have up to three different blood alleles.
E)   When inherited together, A and B blood types exhibit codominance.F) A) and C)
G) B) and E)

Question 20

Which of the following is true with regards to the law of independent assortment?

Accepted Answer

A)   Each individual has two factors for each trait.
B)   Genes segregate during gamete formation.
C)   Gametes contain only one gene from each pair.
D)   During fertilization, each new individual obtains two genes for each trait.
E)   Each pair of alleles assorts independently of the other allele pairs.F) C) and E)
G) D) and E) E

Exam 10: Patterns of Inheritance

Correct Answer
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A couple has three children, two of which have blonde hair. The third child and both parents have dark hair. What can be determined about the gene for hair color in this family?

Correct Answer
verified

Alleles that are linked on the same chromosome will always assort independently during meiosis.

Correct Answer
verified

Correct Answer
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Correct Answer
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Alleles are

Correct Answer
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Which of the following is true in regards to an autosomal recessive pedigree?

Correct Answer
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If a homozygous black bull is mated with a homozygous white cow and the calf is gray, this would be an example of . However, if the calf has black and white spots, this would be an example of.

Correct Answer
verified

Sickle-cell disease is caused by a single mutation in the DNA of a particular gene. A person with this disease has red blood cells that lose their original donut shape and form a sickle shape. People with this disorder suffer from low energy levels, blood clots, and strokes. This is an example of

Correct Answer
verified

Correct Answer
verified

If both parents express a particular trait, but their child does not, what does this indicate about the trait?

Correct Answer
verified

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of histraits. If blue eyes and left-handedness are recessive, how many different phenotypes are possible in their children?

Correct Answer
verified

What does true-breeding mean?

Correct Answer
verified

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

Correct Answer
verified

Which of the following is mismatched?

Correct Answer
verified

Primroses have white flowers when grown above 32°C but red flowers when grown at 24°C. This interaction between phenotypic expression and environment is an example of

Correct Answer
verified
D

Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of

Correct Answer
verified

Cold weather can change what aspect of a Himalayan rabbit?

Correct Answer
verified
A

Which of the following is an inaccurate statement about human blood types?

Correct Answer
verified

Which of the following is true with regards to the law of independent assortment?

Correct Answer
verified
E

Exam 10: Patterns of Inheritance

Correct AnswerverifiedShow Answer

A couple has three children, two of which have blonde hair. The third child and both parents have dark hair. What can be determined about the gene for hair color in this family?

Correct AnswerverifiedShow Answer

Alleles that are linked on the same chromosome will always assort independently during meiosis.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Alleles are

Correct AnswerverifiedShow Answer

Which of the following is true in regards to an autosomal recessive pedigree?

Correct AnswerverifiedShow Answer

If a homozygous black bull is mated with a homozygous white cow and the calf is gray, this would be an example of ________. However, if the calf has black and white spots, this would be an example of________.

Correct AnswerverifiedShow Answer

Sickle-cell disease is caused by a single mutation in the DNA of a particular gene. A person with this disease has red blood cells that lose their original donut shape and form a sickle shape. People with this disorder suffer from low energy levels, blood clots, and strokes. This is an example of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If both parents express a particular trait, but their child does not, what does this indicate about the trait?

Correct AnswerverifiedShow Answer

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of histraits. If blue eyes and left-handedness are recessive, how many different phenotypes are possible in their children?

Correct AnswerverifiedShow Answer

What does true-breeding mean?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is mismatched?

Correct AnswerverifiedShow Answer

Primroses have white flowers when grown above 32°C but red flowers when grown at 24°C. This interaction between phenotypic expression and environment is an example of

Correct AnswerverifiedD

Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of

Correct AnswerverifiedShow Answer

Cold weather can change what aspect of a Himalayan rabbit?

Correct AnswerverifiedA

Which of the following is an inaccurate statement about human blood types?

Correct AnswerverifiedShow Answer

Which of the following is true with regards to the law of independent assortment?

Correct AnswerverifiedE

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If a homozygous black bull is mated with a homozygous white cow and the calf is gray, this would be an example of . However, if the calf has black and white spots, this would be an example of.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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D

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A

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E