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Punnett Squares & Heredity

Total questions: 10

Worksheet time: 12mins

Name
Class
Date
1.

T - tall and t = short

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

a)

tt

b)

Tt

c)

TT

2.

G = green, g = yellow

The genotype for a yellow plant is...

a)

GG

b)

Gg

c)

gg

d)

all of the choices result in yellow

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.

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

a)

0%

b)

25%

c)

50%

d)

75%

5.

Two brown eyed parents (Bb) have a baby. What is the chance their baby is blue eyed (bb)? Draw the Punnett square for help

a)

0 %

b)

25%

c)

50%

d)

75%

6.

Aa, DD, Ba, and yy are all examples of ---

a)

genotypes

b)

phenotypes

7.

AA and Aa always show up as ---

a)

dominant.

b)

recessive.

8.

Which of the following genotypes is homozygous dominant?

a)

aa

b)

Aa

c)

AA

9.

Which of the following genotypes is heterozygous?

a)

Bb

b)

BB

c)

bb

10.

Brown eyes are dominant (D) over blue eyes (d). What is the probability that the offspring will have brown eyes in this cross? Complete the Punnett square for help

a)

25%

b)

50%

c)

75%

d)

100%