Question 1

The filled-in squares of a Punnett square represent

Accepted Answer

A)  the numbers of individuals with each version of a trait. 
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 4 offspring. 
D)  examples of some of the offspring that can arise from a one-trait cross. 
E)  the gametes from one parent. 
A)  the numbers of individuals with each version of a trait. 
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 4 offspring. 
D)  examples of some of the offspring that can arise from a one-trait cross. 
E)  the gametes from one parent.

Question 2

In a dihybrid cross where both parents are heterozygous, the phenotypic ratio is ________.

Accepted Answer

A)  1:2:1 
B)  9:3:3:1 
C)  1:1:1 
D)  3:1 
E)  1:1:1:1 
A)  1:2:1 
B)  9:3:3:1 
C)  1:1:1 
D)  3:1 
E)  1:1:1:1

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

How many different gametes can be produced from the genotype AaBBDDEeff?

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  8 
E)  16 
A)  1 
B)  2 
C)  4 
D)  8 
E)  16

Question 5

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 6

The garden pea was a good model for Mendel's genetics experiments. Which of the following is NOT true regarding this model organism?

Accepted Answer

A)  The plants were easy to grow. 
B)  Pea plants can either cross-pollinate or self-pollinate. 
C)  There was only one variety of pea available to Mendel. 
D)  The plants had several traits that were easily identified. 
E)  Most of the traits studied had no intermediate stage. 
A)  The plants were easy to grow. 
B)  Pea plants can either cross-pollinate or self-pollinate. 
C)  There was only one variety of pea available to Mendel. 
D)  The plants had several traits that were easily identified. 
E)  Most of the traits studied had no intermediate stage.

Question 7

Ryan has type A blood and is color-blind (an X-linked recessive trait). Which of the following combinations are possible for his parents?

Accepted Answer

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

Question 8

If the parental genotype if EeWw what are the potential allele combinations that could occur at the end of Meiosis?

Accepted Answer

A)  EW, Ew, eW, and ew 
B)  EW, EE, eW, and ww 
C)  WW, Ew, EW, and ew 
D)  EE, WW, ee, and ww 
E)  EW, Ew, ee and ww 
A)  EW, Ew, eW, and ew 
B)  EW, EE, eW, and ww 
C)  WW, Ew, EW, and ew 
D)  EE, WW, ee, and ww 
E)  EW, Ew, ee and ww

Question 9

What are all possible gametes that can be produced by an individual with the following genotype, FFGg?

Accepted Answer

A)  Fg, FG 
B)  FF 
C)  Fg 
D)  FG, Fg, fG, fg 
E)  Fg, fG 
A)  Fg, FG 
B)  FF 
C)  Fg 
D)  FG, Fg, fG, fg 
E)  Fg, fG

Question 10

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 11

The distance between the alleles for one trait and the alleles for a second trait is called the

Accepted Answer

A)  map units 
B)  gap distance 
C)  dominant distance 
D)  gene locus 
A)  map units 
B)  gap distance 
C)  dominant distance 
D)  gene locus

Question 12

Which of the following is TRUE?

Accepted Answer

A)  Females can be heterozygous for sex-linked traits. 
B)  All traits on the sex chromosomes are associated with sexual development. 
C)  Males are heterozygous for the SRY gene. 
D)  The X and Y chromosomes are homologous. 
E)  Men pass their X-linked traits to their sons. 
A)  Females can be heterozygous for sex-linked traits. 
B)  All traits on the sex chromosomes are associated with sexual development. 
C)  Males are heterozygous for the SRY gene. 
D)  The X and Y chromosomes are homologous. 
E)  Men pass their X-linked traits to their sons.

Question 13

Linked genes

Accepted Answer

A)  always assort independently. 
B)  undergo crossing over of sister chromatids at a high rate. 
C)  are found on homologous chromosomes. 
D)  never cross over during prophase I. 
E)  tend to be close together on a single chromosome. 
A)  always assort independently. 
B)  undergo crossing over of sister chromatids at a high rate. 
C)  are found on homologous chromosomes. 
D)  never cross over during prophase I. 
E)  tend to be close together on a single chromosome.

Question 14

Which of the following is not a correct match?

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 - genotype 
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 - genotype

Question 15

The outcome of a genetic cross involving eye color and body type is predicted to have a 25%: 25%: 25%: 25% ratio. When bred the organisms produced offspring with the following ratio 45%: 45%: 3%: 3%. These results are most likely due to:

Accepted Answer

A)  the two genes in question being linked on the same chromosome 
B)  a spontaneous mutation within the offspring 
C)  pure chance 
D)  an innacurate prediction for the 25%: 25%: 25%: 25% ratio 
E)  the two genes being on separate chromosomes 
A)  the two genes in question being linked on the same chromosome 
B)  a spontaneous mutation within the offspring 
C)  pure chance 
D)  an innacurate prediction for the 25%: 25%: 25%: 25% ratio 
E)  the two genes being on separate chromosomes

Question 16

Which variable will determine the coat color in Himalayan rabbits?

Accepted Answer

A)  the genetics will determine it 100% 
B)  the environment will determine it 100% 
C)  both the genetics and environment will determine the coat color 
D)  neither the environment or genes will play a role in determining coat color 
A)  the genetics will determine it 100% 
B)  the environment will determine it 100% 
C)  both the genetics and environment will determine the coat color 
D)  neither the environment or genes will play a role in determining coat color

Question 17

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 18

Red-green colorblindness is a recessive X-linked trait. If a female is red-green colorblind, which of the following is TRUE?

Accepted Answer

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

Question 19

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

Question 20

Morgan buys a male python from a snake dealer who tells him that the snake carries the albino allele. Morgan mates the snake with an albino female and 4 normally pigmented offspring are produced. Morgan rushes back to the snake dealer and demands his money back stating that the male he bought is not heterozygous for the albino allele because all of its offspring had normal pigmentation.

Accepted Answer

A)  True because according to the laws of probability, at least one of the offspring should have been an albino. 
B)  True because 50% of all offspring produced must be albino. 
C)  False because for each offspring there is a 50% chance that it will have normal pigmentation. 
D)  False because a heterozygous male will only pass the dominant allele to its offspring. 
E)  True because if at least one parent is homozygous recessive, at least one of their offspring must also show the recessive trait. 
A)  True because according to the laws of probability, at least one of the offspring should have been an albino. 
B)  True because 50% of all offspring produced must be albino. 
C)  False because for each offspring there is a 50% chance that it will have normal pigmentation. 
D)  False because a heterozygous male will only pass the dominant allele to its offspring. 
E)  True because if at least one parent is homozygous recessive, at least one of their offspring must also show the recessive trait.

Exam 10: Patterns of Inheritance

The filled-in squares of a Punnett square represent

In a dihybrid cross where both parents are heterozygous, the phenotypic ratio is ________.

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

How many different gametes can be produced from the genotype AaBBDDEeff?

A heterozygote for a trait exhibiting incomplete dominance will

The garden pea was a good model for Mendel's genetics experiments. Which of the following is NOT true regarding this model organism?

Ryan has type A blood and is color-blind (an X-linked recessive trait). Which of the following combinations are possible for his parents?

If the parental genotype if EeWw what are the potential allele combinations that could occur at the end of Meiosis?

What are all possible gametes that can be produced by an individual with the following genotype, FFGg?

Which of the following is an example of a phenotype?

The distance between the alleles for one trait and the alleles for a second trait is called the

Which of the following is TRUE?

Linked genes

Which of the following is not a correct match?

The outcome of a genetic cross involving eye color and body type is predicted to have a 25%: 25%: 25%: 25% ratio. When bred the organisms produced offspring with the following ratio 45%: 45%: 3%: 3%. These results are most likely due to:

Which variable will determine the coat color in Himalayan rabbits?

A male is always homozygous for a trait that is _________.

Red-green colorblindness is a recessive X-linked trait. If a female is red-green colorblind, which of the following is TRUE?

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 ________________.

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