Question 1

Which of the following is true about an individual with the chromosomes shown in this figure?

Accepted Answer

A)  All offspring will have the dominant phenotype for each trait. 
B)  All offspring will have the recessive phenotype for each trait. 
C)  A maximum of 4 different gametes are possible with 4 traits. 
D)  The individual is heterozygous for all traits. 
E)  The individual is homozygous for at least one trait. 
A)  All offspring will have the dominant phenotype for each trait. 
B)  All offspring will have the recessive phenotype for each trait. 
C)  A maximum of 4 different gametes are possible with 4 traits. 
D)  The individual is heterozygous for all traits. 
E)  The individual is homozygous for at least one trait.

Question 2

Martha has a widow's peak and attached earlobes. Martha's dad had a straight hairline and unattached earlobes. What is Martha's genotype?

Accepted Answer

A)  WWEE 
B)  WwEE 
C)  wwee 
D)  WwEe 
E)  Wwee 
A)  WWEE 
B)  WwEE 
C)  wwee 
D)  WwEe 
E)  Wwee

Question 3

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

Accepted Answer

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

Question 4

Morgan buys a male python from a snake dealer who tells him that the snake carries the albino allele. What is the most effective way for Morgan verify this statement?

Accepted Answer

A)  Breed the snake with a heterozygous female. 
B)  Breed the snake with a homozygous normal female. 
C)  Breed the snake with a female sibling. 
D)  Breed the snake with a homozygous recessive albino female. 
E)  He can breed the snake with any female and a portion of the offspring will always be albino. 
A)  Breed the snake with a heterozygous female. 
B)  Breed the snake with a homozygous normal female. 
C)  Breed the snake with a female sibling. 
D)  Breed the snake with a homozygous recessive albino female. 
E)  He can breed the snake with any female and a portion of the offspring will always be albino.

Question 5

A man with blood type A and a woman with blood type B can have a baby with blood type O blood.

Accepted Answer

A)  True because A and B are the dominant blood types and 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 an offspring with the recessive blood type. 
E)  True because only 1 O allele is needed. 
A)  True because A and B are the dominant blood types and 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 an offspring with the recessive blood type. 
E)  True because only 1 O allele is needed.

Question 6

Which of the following is NOT true with regard to the law of segregation?

Accepted Answer

A)  Each individual has 2 factors for each trait. 
B)  Genes segregate during gamete formation. 
C)  Gametes contain only 1 gene from each pair. 
D)  During fertilization, each new individual obtains 2 genes for each trait. 
E)  Each gamete contains 2 genes for each trait. 
A)  Each individual has 2 factors for each trait. 
B)  Genes segregate during gamete formation. 
C)  Gametes contain only 1 gene from each pair. 
D)  During fertilization, each new individual obtains 2 genes for each trait. 
E)  Each gamete contains 2 genes for each trait.

Question 7

Which of the following is incorrectly matched?

Accepted Answer

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

Question 8

Vitamin-D resistant rickets is a sex-linked dominant trait which leads to softening of the bones which can cause fractures and deformities. Rickets is often due to a deficiency of vitamin D, however, with vitamin-D resistant rickets, ingestion of vitamin D is ineffective. Maria's mother is normal and does not display any symptoms of this disease; however, Maria's father has the disease. Maria marries a man that does not have the disease. What is the probability that they will have a daughter that has the disease?

Accepted Answer

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

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

Question 10

Amy has wavy hair and 6 fingers (an autosomal dominant trait). Which of the following combinations are possible for her parents?

Accepted Answer

A)  5 only 
B)  1 and 2 
C)  1, 3, and 4 
D)  2, 4, and 5 
E)  2 and 4 
A)  5 only 
B)  1 and 2 
C)  1, 3, and 4 
D)  2, 4, and 5 
E)  2 and 4

Question 11

Vitamin-D resistant rickets is a sex-linked dominant trait which leads to softening of the bones which can cause fractures and deformities. Rickets is often due to a deficiency of vitamin D, however, with vitamin-D resistant rickets, ingestion of vitamin D is ineffective. Maria's mother is normal and does not display any symptoms of this disease; however, Maria's father has the disease. Maria marries a man that does not have the disease. What is the probability that they will have a son that has the disease?

Accepted Answer

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

Question 12

In a one-trait test cross, the phenotype that disappears in the F1 generation is the ______.

Accepted Answer

A)  dominant trait 
B)  negative trait 
C)  recessive trait 
D)  heterozygote 
E)  homozygote 
A)  dominant trait 
B)  negative trait 
C)  recessive trait 
D)  heterozygote 
E)  homozygote

Question 13

Which of the following is not a correct match?

Accepted Answer

A)  pollen - male 
B)  stigma - female 
C)  anther - female 
D)  ovule - female 
E)  ovary - female 
A)  pollen - male 
B)  stigma - female 
C)  anther - female 
D)  ovule - female 
E)  ovary - female

Question 14

Vitamin-D resistant rickets is a sex-linked dominant trait which leads to softening of the bones which can cause fractures and deformities. Rickets is often due to a deficiency of vitamin D, however, with vitamin-D resistant rickets, ingestion of vitamin D is ineffective. Maria's mother is normal and does not display any symptoms of this disease; however, Maria's father has the disease. Will Maria have the disease?

Accepted Answer

A)  Yes because this is a dominant disease so only one copy of the bad gene is needed to express the disease. 
B)  No because 2 copies of the gene are needed for a woman to display symptoms of an X-linked trait. 
C)  Yes because a daughter always expresses X-linked traits that she inherits from her from her father. 
D)  No, only male children will exhibit X-linked traits. 
E)  Yes, because Maria's mother is likely a carrier for the disease. 
A)  Yes because this is a dominant disease so only one copy of the bad gene is needed to express the disease. 
B)  No because 2 copies of the gene are needed for a woman to display symptoms of an X-linked trait. 
C)  Yes because a daughter always expresses X-linked traits that she inherits from her from her father. 
D)  No, only male children will exhibit X-linked traits. 
E)  Yes, because Maria's mother is likely a carrier for the disease.

Question 15

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%

Exam 10: Patterns of Inheritance

Which of the following is true about an individual with the chromosomes shown in this figure?

Martha has a widow's peak and attached earlobes. Martha's dad had a straight hairline and unattached earlobes. What is Martha's genotype?

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

Morgan buys a male python from a snake dealer who tells him that the snake carries the albino allele. What is the most effective way for Morgan verify this statement?

A man with blood type A and a woman with blood type B can have a baby with blood type O blood.

Which of the following is NOT true with regard to the law of segregation?

Which of the following is incorrectly matched?

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

Amy has wavy hair and 6 fingers (an autosomal dominant trait). Which of the following combinations are possible for her parents?

In a one-trait test cross, the phenotype that disappears in the F1 generation is the ______.

Which of the following is not a correct match?

A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila. What proportion of the female offspring will have white eyes?

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