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WorksheetsPunnet Square Practice
Total questions: 15
Worksheet time: 24mins
Name
Class
Date
1.
Which is Heterozygous?
a)
Tt
b)
BB
c)
ff
d)
Dominant
2.
Which is homozygeous?
a)
Tt
b)
BB
c)
Ff
d)
Blue
3.
What are the chances that the offspring will have homozygous recessive traits?
a)
1 in 4
b)
3 out of 4
c)
75%
d)
50%
4.
What are the chances of heterozygous genotypes in offspring?
a)
50%
b)
25%
c)
1 in 4
d)
75%
5.
What is the dominant trait here?
a)
Bb
b)
Recessive eyes
c)
Blue eyes
d)
Brown eyes
6.
Red-green color blindness is an X-linked recessive trait. A red-green color-blind woman and a red-green color-blind man have a son. What is the probability that the son is also red-green color-blind?
a)
0%
b)
25%
c)
50%
d)
100%
7.
Black hair color is dominant to white hair color in mice. Determine the phenotypic ratio for the offpring of a heterozygous black mouse and a white mouse.
a)
4 Black: 0 White
b)
3 Black: 1 White
c)
2 Black: 2 White
d)
0 Black: 4 White
8.
Red-green color blindness is an X-linked recessive trait. A red-green color-blind woman and a red-green color-blind man have a son. What is the probability that the son is also red-green color-blind?
a)
0%
b)
25%
c)
50%
d)
100%
9.
What does a filled in square represent?
a)
Not affected Female
b)
Not affected Male
c)
Affected Male
d)
Affected Female
10.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
11.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
12.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)
8
b)
5
c)
2
d)
3
13.
What do half colored symbols represent?
a)
The individual is a carrier (heterozygous).
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
14.
What does an open circle represent?
a)
Not Affected Male
b)
Not Affected Female
c)
Affected Male
d)
Affected Female
15.
In the second generation-how many people are carriers of the trait?
a)
2
b)
3
c)
5
d)
6
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