wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Punnett Square practice

Total questions: 27

Worksheet time: 36mins

Name
Class
Date
1.

T - tall and t = short

In the punnett square below, what belongs in the missing square

a)

tt

b)

Tt

c)

Bb

d)

TT

2.

Each one of the boxes on the Punnett Square represents what probability of an offspring's' genotype?

a)

25%

b)

1%

c)

10%

d)

0%

3.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
4.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
5.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
6.

T - tall and t = short

In the Punnett square, what belongs in the missing square?

a)

tt

b)

Tt

c)

TT

7.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
8.

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, how many offspring would be black?

a)

0

b)

1

c)

2

d)

3

e)

4

9.

Cody crosses a plant producing wrinkled peas with a plant producing smooth peas. Weeks later, he discovers that all the offspring plants have smooth peas. Cody drew the Punnett square above to show the genotypes of the offspring plants. What were the genotypes of the parent plants?

a)

RR and rr

b)

Rr and Rr

c)

RR and Rr

d)

Rr and rr

10.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
11.

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, the offspring in box 4 would:

a)

be white.

b)

be heterozygous.

c)

be gray.

d)

be homozygous.

12.

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, how many offspring would be black?

a)

0

b)

1

c)

2

d)

3

e)

4

13.
What is the yellow seed genotype?
a)
aa
b)
Aa
c)
AA
d)
AA or Aa
14.

What genotype would go in box 4?

a)

BB

b)

Bb

c)

bb

15.

What are the possible genotypes of the offspring? (A-Brown hair; a-blond hair)

a)

AA, Aa, aa

b)

AA only

c)

Aa only

d)

aa only

16.

What genotype would go in box 1?

a)

BB

b)

Bb

c)

bb

17.
What is the missing allele?
a)
a
b)
A
c)
AA
d)
aa
18.

What is the mother's genotype?

a)

DD

b)

Dd

c)

dd

19.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
20.
What genotype would go in box 2?
a)
BB
b)
Bb
c)
bb
21.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
22.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
a)
50 % Brown Hair and 50% Blond Hair 
b)
25 % Brown Hair and 75% Blond Hair 
c)
75 % Brown Hair and 25% Blond Hair 
d)
0% Brown Hair and 100% Blond Hair 
23.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?
a)
25%
b)
0%
c)
100%
d)
50%
24.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
25.

What is ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness? T = tall t = short

a)

0 in 4

b)

1 in 4

c)

2 in 4

d)

4 in 4

26.

Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?

a)

25%

b)

50%

c)

75%

d)

100%

27.
Which is a true statements about this picture?
a)
Brown is recessive
b)
Brown is dominant
c)
Blue is dominant
d)
Blue is codominant