Question 1

In the following pedigree, what does the colored circle indicate?

Accepted Answer

A)  an affected father 
B)  an affected mother 
C)  an affected daughter 
D)  an affected son 
E)  an affected cousin 
A)  an affected father 
B)  an affected mother 
C)  an affected daughter 
D)  an affected son 
E)  an affected cousin

Question 2

An individual's physical characteristics, or microscopic and metabolic characteristics, are known as their

Accepted Answer

A)  phenotype. 
B)  genotype. 
C)  alleles. 
D)  traits. 
E)  pedigree. 
A)  phenotype. 
B)  genotype. 
C)  alleles. 
D)  traits. 
E)  pedigree.

Question 3

A cross is made between two parents with genotypes AaBB and aabb. If there are 32 offspring, how many of them would be expected to exhibit both dominant characteristics?

Accepted Answer

A)  32 
B)  24 
C)  16 
D)  8 
E)  0 
A)  32 
B)  24 
C)  16 
D)  8 
E)  0

Question 4

Albinism is inherited as a recessive trait. An albino woman is married to a man with normal coloring and their first child is an albino. What was the genotype of the man?

Accepted Answer

A)  homozygous dominant 
B)  heterozygous 
C)  homozygous recessive 
D)  incompletely dominant 
E)  sex-linked recessive 
A)  homozygous dominant 
B)  heterozygous 
C)  homozygous recessive 
D)  incompletely dominant 
E)  sex-linked recessive

Question 5

What genotypic ratio would result from a cross between two individuals who are both heterozygous for a trait?

Accepted Answer

A)  100% homozygous dominant 
B)  100% homozygous recessive 
C)  50% homozygous dominant, 50% homozygous recessive 
D)  25% homozygous dominant, 50% heterozygous, 25% homozygous recessive 
E)  50% homozygous dominant, 50% heterozygous 
A)  100% homozygous dominant 
B)  100% homozygous recessive 
C)  50% homozygous dominant, 50% homozygous recessive 
D)  25% homozygous dominant, 50% heterozygous, 25% homozygous recessive 
E)  50% homozygous dominant, 50% heterozygous

Question 6

Which of the following would be considered a heterozygous dihybrid genotype?

Accepted Answer

A)  Ww 
B)  sS 
C)  WWSs 
D)  WWss 
E)  WwSs 
A)  Ww 
B)  sS 
C)  WWSs 
D)  WWss 
E)  WwSs

Question 7

A cross that involves two traits is called a

Accepted Answer

A)  monohybrid cross. 
B)  dihybrid cross. 
C)  Punnett square. 
D)  testcross. 
E)  trihybrid cross. 
A)  monohybrid cross. 
B)  dihybrid cross. 
C)  Punnett square. 
D)  testcross. 
E)  trihybrid cross.

Question 8

Which of the following is true according to Mendel's law of segregation?

Accepted Answer

A)  Each individual contains two alleles for each trait. 
B)  Fertilization restores the presence of two alleles. 
C)  Alleles separate from each other during gamete formation. 
D)  Each gamete contains one copy of each allele. 
E)  All of the answer choices are true about Mendel's law of segregation. 
A)  Each individual contains two alleles for each trait. 
B)  Fertilization restores the presence of two alleles. 
C)  Alleles separate from each other during gamete formation. 
D)  Each gamete contains one copy of each allele. 
E)  All of the answer choices are true about Mendel's law of segregation.

Question 9

In guinea pigs, B = black, b = brown, S = short hair, s = long hair. A guinea pig heterozygous for both traits is mated with a brown, short-haired guinea pig whose mother had long hair. What phenotypic ratio is expected in the offspring?

Accepted Answer

A)  9 black long hair, 3 black short hair, 3 brown long hair, 1 brown short hair. 
B)  9 black short hair, 6 black long hair, 3 brown long hair, 1 black short hair. 
C)  6 black short hair, 1 black long hair, 6 brown short hair, 2 brown long hair. 
D)  6 brown short hair, 6 black long hair, 2 brown long hair, 2 black short hair. 
E)  1 black short hair, 1 black long hair, 1 brown short hair, 1 brown long hair. 
A)  9 black long hair, 3 black short hair, 3 brown long hair, 1 brown short hair. 
B)  9 black short hair, 6 black long hair, 3 brown long hair, 1 black short hair. 
C)  6 black short hair, 1 black long hair, 6 brown short hair, 2 brown long hair. 
D)  6 brown short hair, 6 black long hair, 2 brown long hair, 2 black short hair. 
E)  1 black short hair, 1 black long hair, 1 brown short hair, 1 brown long hair.

Question 10

A pheasant breeder starts with two birds in the P generation, one of which is AA and the other is aa. If he takes two of the birds from the F1 generation and breeds them together, what genotypes can he expect in his F2 offspring?

Accepted Answer

A)  AA and Aa 
B)  Aa and aa 
C)  AA, Aa, and aa 
D)  AA only 
E)  Aa only 
A)  AA and Aa 
B)  Aa and aa 
C)  AA, Aa, and aa 
D)  AA only 
E)  Aa only

Question 11

In cattle, consider that the lack of horns is dominant to the presence of horns. A bull without horns is crossed with a horned cow. All eight offspring lack horns. The bull is most likely

Accepted Answer

A)  homozygous dominant. 
B)  homozygous recessive. 
C)  heterozygous. 
D)  sex-lined recessive. 
E)  heterozygous recessive. 
A)  homozygous dominant. 
B)  homozygous recessive. 
C)  heterozygous. 
D)  sex-lined recessive. 
E)  heterozygous recessive.

Question 12

Mendel carried out most of his research with

Accepted Answer

A)  livestock. 
B)  pea plants. 
C)  guinea pigs. 
D)  fruit flies. 
E)  bacteria. 
A)  livestock. 
B)  pea plants. 
C)  guinea pigs. 
D)  fruit flies. 
E)  bacteria.

Question 13

In which kind of cross could you expect to find ratios of 1:1:1:1 among the offspring?

Accepted Answer

A)  monohybrid cross 
B)  dihybrid cross 
C)  one-trait testcross 
D)  two-trait testcross 
E)  No cross will yield offspring in 1:1:1:1 ratios. 
A)  monohybrid cross 
B)  dihybrid cross 
C)  one-trait testcross 
D)  two-trait testcross 
E)  No cross will yield offspring in 1:1:1:1 ratios.

Exam 23: Patterns of Gene Inheritance

In the following pedigree, what does the colored circle indicate?

An individual's physical characteristics, or microscopic and metabolic characteristics, are known as their

A cross is made between two parents with genotypes AaBB and aabb. If there are 32 offspring, how many of them would be expected to exhibit both dominant characteristics?

Albinism is inherited as a recessive trait. An albino woman is married to a man with normal coloring and their first child is an albino. What was the genotype of the man?

What genotypic ratio would result from a cross between two individuals who are both heterozygous for a trait?

Which of the following would be considered a heterozygous dihybrid genotype?

A cross that involves two traits is called a

Which of the following is true according to Mendel's law of segregation?

In guinea pigs, B = black, b = brown, S = short hair, s = long hair. A guinea pig heterozygous for both traits is mated with a brown, short-haired guinea pig whose mother had long hair. What phenotypic ratio is expected in the offspring?

A pheasant breeder starts with two birds in the P generation, one of which is AA and the other is aa. If he takes two of the birds from the F1 generation and breeds them together, what genotypes can he expect in his F2 offspring?

In cattle, consider that the lack of horns is dominant to the presence of horns. A bull without horns is crossed with a horned cow. All eight offspring lack horns. The bull is most likely

Mendel carried out most of his research with

In which kind of cross could you expect to find ratios of 1:1:1:1 among the offspring?

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A pheasant breeder starts with two birds in the P generation, one of which is AA and the other is aa. If he takes two of the birds from the F₁ generation and breeds them together, what genotypes can he expect in his F₂ offspring?