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Monohybrid Practice Answers

Total questions: 10

Worksheet time: 20mins

Name
Class
Date
1.

Widow's peak is dominant to no widow's peak. Determine the genotype and phenotype ratios for a homozygous dominant female and a homozygous recessive male.

a)

4:4 Ww, 4:4 widow's peak

b)

2:4 Ww, 2:4 WW

4:4 Widow's peak

c)

2:4 ww, 2:4 WW

2:4 No widow's peak 2:4 Widow's peak

d)

2:4 Ww, 2:4 ww

2:4 Widow's peak 2:4 no widow's peak

2.

Dimples is dominant to no dimples. Determine the genotype and phenotype ratios for a heterozygous female and a homozygous dominant male.

a)

2:4 dd 2:4 DD

2:4 no dimples 2:4 dimples

b)

1:4 DD 2:4 Dd 2:4 dd

3:4 dimples 1:4 no dimples

c)

2:4 DD 2:4 Dd

4:4 dimples

d)

4:4 Dd

4:4 dimples

3.

Short hair is dominant to long hair in mice. Determine the genotype and phenotype ratios for a homozygous recessive female and a heterozygous male.

a)

2:4 SS 2:4 Ss

4:4 short hair

b)

2:4 Ss 2:4 ss

2:4 short hair 2:4 long hair

c)

2:4 Ss 2:4 ss

4:4 long hair

d)

1:4 SS 2:4 Ss 1:4 ss

3:4 short hair 1:4 long hair

4.

Cleft chin is dominant to no cleft chin. Determine the genotype and phenotype ratios for a heterozygous female and a heterozygous male.

a)

1:4 CC 2:4 Cc 1:4 cc

3:4 cleft chin 1:4 no cleft chin

b)

2:4 Cc 2:4 cc

2:4 cleft chin 2:4 no cleft chin

c)

2:4 Cc 2:4 cc

2:4 cleft chin 2:4 no cleft chin

d)

2:4 CC 2:4 Cc

4:4 cleft chin

5.

Brown eyes are dominant to blue eyes. Determine the genotype and phenotype ratios for a homozygous dominant female and a homozygous dominant male.

a)

1:4 BB 2:4 Bb 1:4 bb

3:4 Brown eyes 1:4 blue eyes

b)

2:4 BB 2:4 Bb

4:4 Brown eyes

c)

4:4 BB

4:4 Brown eyes

d)

3:4 BB 1:4 Bb

4:4 Brown eyes

6.

Purple flowers are dominant to white flowers in pea plants. Determine the genotype and phenotype ratios for a homozygous dominant female and a heterozygous male.

a)

2:4 PP 2:4 Pp

4:4 white

b)

2:4 PP 2:4 Pp

4:4 purple

c)

1:4 PP 2:4 Pp 1:4 pp

3:4 purple 1:4 white

d)

2:4 PP 2:4 pp

2:4 purple 2:4 white

7.

Brown hair is dominant to gray hair in mice. Determine the genotype and phenotype ratios for a homozygous recessive female and a homozygous recessive male.

a)

2:4 Bb 2:4 bb

2:4 brown hair 2:4 gray hair

b)

2:4 BB 2:4 bb

2:4 brown hair 2:4 gray hair

c)

4:4 Bb

4:4 brown hair

d)

4:4 bb

4:4 gray hair

8.

Free ear lobes are dominant to attached ear lobes. Determine the genotype and phenotype ratios for a heterozygous female and a homozygous recessive male.

a)

2:4 FF 2:4 Ff

4:4 free ear lobes

b)

2:4 Ff 2:4 ff

2:4 free ear lobes 2:4 attached ear lobes

c)

3:4 FF 1:4 ff

3:4 free ear lobes 1:4 attached ear lobes

d)

1:4 FF 2:4 Ff 1:4 ff

3:4 free ear lobes 1:4 attached ear lobes

9.

Green peas are dominant to yellow peas. Determine the genotype and phenotype ratios for a heterozygous female and a heterozygous male.

a)

3:4 Gg 1:4 gg

3:4 green 1:4 yellow

b)

2:4 GG 2:4 gg

2:4 green 2:4 yellow

c)

3:4 Gg 1:4 gg

3:4 green 1:4 yellow

d)

1:4 GG 2:4 Gg 1:4 gg

3:4 green 1:4 yellow

10.

Tall plants are dominant to short plants. Determine the genotype and phenotype ratios for a homozygous recessive female and a homozygous dominant male.

a)

2:4 TT 2:4 tt

2:4 tall 2:4 short

b)

4:4 Tt

4:4 tall

c)

2:4 TT 2:4 Tt

4:4 tall

d)

1:4 TT 2:4 Tt 1:4 tt

3:4 tall 1:4 short