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Genetics Test Review

Total questions: 42

Worksheet time: 21mins

Name
Class
Date
1.

Using the Punnett Square in the picture, predict the genotype that would be found in the box with the question mark

a)

TT

b)

Tt

c)

tt

d)

impossible to determine from information given

2.

Which of the following tools is used to match up chromosome pairs and organize them by size?

a)

pedigree chart

b)

karotype

c)

meiosis map

d)

linkage map

3.

Homozygous dominant is an example of a_____?

a)

monotype

b)

karyotype

c)

genotype

d)

phenotype

4.

Which of the following is heterozygous?

a)

AA

b)

Aa

c)

aa

d)

none of the above

e)

all of the above

5.

Using the pedigree, how many offspring did couple II- 1 & II-2 have?

a)

2

b)

3

c)

4

d)

6

6.

Using the pedigree chart, what must be the mode of inheritance in this PTC tasting gene?

a)

autosomal dominant

b)

autosomal recessive

c)

sex-linked dominant

d)

sex-linked recessive

7.

Using the pedigree chart, what must be the genotype of individual II-4?

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous carrier

d)

homozygous carrier

8.

In complete dominance problems, which of the following genotypes will express the dominant phenotype?

a)

Tt

b)

TT

c)

tt

d)

Both TT and tt

e)

Both TT and Tt

9.

How many phenotypes are possible when a trait is governed by complete dominance?

a)

1

b)

2

c)

3

d)

4

10.

What is the predicted percentage of individuals in the Punnett square shown that will express the dominant trait?

a)

25%

b)

50%

c)

75%

d)

100%

11.

What is the expected percentage in the following Punnett Square that will show the homozygous recessive genotype?

a)

25%

b)

50%

c)

75%

d)

100%

12.

What is the expected phenotype ratio in the diagram shown?

a)

50% tall : 50% short

b)

25% tall: 75% short

c)

75% tall: 25% short

d)

100% tall: 0% short

13.

What is the expected genotype ratio in the diagram shown?

a)

50% Tt: 50% tt

b)

25% TT: 50% Tt : 25% tt

c)

75% Tt: 25% tt

d)

100% tt

14.

In incomplete dominance, a heterozygous genotype will exhibit which of the following?

a)

one allele

b)

two alleles together, each expressed independently

c)

two alleles together, blended together to make a new phenotype

d)

two alleles

15.

How many phenotypes are possible when working with incompletely dominant alleles?

a)

1

b)

2

c)

3

d)

4

16.

If a tall plant is expressed with a T and a short plant is expressed with a t, what would be the phenotype of Tt if this gene exhibits incomplete dominance?

a)

taller than normal

b)

tall

c)

medium

d)

short

e)

shorter than normal

17.

What are the possible genotypes of the offspring from the above Punnett square? Check all that apply.

a)

TT

b)

Tt

c)

tt

d)

none of the above

18.

What are the possible phenotypes of the offspring from the above Punnett square if this trait displays incomplete dominance? Check all that apply.

a)

taller than average

b)

tall

c)

medium

d)

short

e)

shorter than average

19.

Which of the following describes Codominance?

a)

one allele is dominant over another

b)

both alleles are dominant so they blend together to make a new phenotype

c)

both alleles are dominant so they both are equally expressed independently in the phenotype

d)

neither allele is dominant so they blend together to make a new phenotype

20.

A calico cat shows the traits for both orange and black fur. What kind of expression is this?

a)

complete dominance

b)

codominance

c)

incomplete dominance

d)

sex-linked inheritance

21.

A mother has blood type AB and a father has blood type A and is heterozygous. Which of the following genotypes show up for the offspring?

a)
b)
c)
d)
22.

A mother has blood type AB and a father has blood type A and is heterozygous. What is the probability of the child having type A blood?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

23.

A mother has blood type AB and a father has blood type A and is heterozygous. What is the probability of the child having type B blood?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

24.

A mother has blood type AB and a father has blood type A and is heterozygous. What is the probability of the child having type O blood?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

25.

A mother has blood type AB and a father has blood type A and is heterozygous. What is the probability of the child having type AB blood?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

26.

Which genotype below represents a female?

a)

XX

b)

XY

c)

neither

27.

Which genotype below represents a male?

a)

XX

b)

XY

c)

neither

28.

Hemophilia is a sex-linked recessive trait. Which of the following would be the genotype of a female with hemophelia?

a)
b)
c)
d)
29.

Hemophilia is a sex-linked recessive trait. Which of the following would be the genotype of a female carrier?

a)
b)
c)
d)
30.

Hemophilia is a sex-linked recessive trait. Which of the following would be the genotype of a male with hemophilia?

a)
b)
c)
d)
31.

Which gender can never be a carrier in sex-linked traits?

a)

male

b)

female

c)

neither

32.

Colorblind vision is a sex-linked trait. A normal male marries a carrier woman. What is the probability that the children will be colorblind?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

33.

Colorblind vision is a sex-linked trait. A normal male marries a carrier woman. What is the probability that the female children will be colorblind?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

34.

Colorblind vision is a sex-linked trait. A normal male marries a carrier woman. What is the probability that the male children will be colorblind?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

35.

Colorblind vision is a sex-linked trait. A normal male marries a carrier woman. What is the probability that the female children will be carriers of the trait?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

36.

What genotype should go where the question mark is in the following Punnett Square?

a)

RRYy

b)

RrYy

c)

rrYy

d)

RRyy

37.

Based off the Punnett Square, what fraction of the offspring will have wrinkled, yellow seeds?

a)

9/16

b)

3/16

c)

1/16

d)

15/16

38.

What is the genotype of a plant heterozygous for purple flower color (P) and homozygous dominant for tall (T)

a)

PPTT

b)

PpTt

c)

PpTT

d)

ppTT

e)

ppTt

39.

What pattern of inheritance is demonstrated in the Punnett square?

a)

autosomal dominant

b)

autosomal recessive

c)

sex-linked dominant

d)

sex-linked recessive

40.

What pattern of inheritance is demonstrated in the Punnett square?

a)

autosomal dominant

b)

autosomal recessive

c)

sex-linked dominant

d)

sex-linked recessive

41.

What pattern of inheritance is demonstrated in the Punnett square?

a)

autosomal dominant

b)

autosomal recessive

c)

sex-linked dominant

d)

sex-linked recessive

42.

What pattern of inheritance is demonstrated in the Punnett square?

a)

autosomal dominant

b)

autosomal recessive

c)

sex-linked dominant

d)

sex-linked recessive

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