Free Printable Incomplete and Codominance Practice

1.

Coat color in mice is incompletely dominant. Yellow (YY) and white-colored (WW) mice are homozygous, while cream-colored mice are heterozygous. If two cream-colored mice mate, what phenotypic ratio can we expect of their offspring? (Y= yellow coat allele, W= white coat allele)

a)

2 YY: 2 WW

b)

1 YY: 2 YW: 1 WW

c)

1 YY: 3 WW

d)

2 YY: 1 YW: 1 WW

2.

In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W). The heterozygous genotype is expressed as pink.

Match the genotype with phenotype

a)

RR

1.

Red flowers

b)

WW

2.

White flowers

c)

RW

3.

Pink flowers

3.

In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W).

A pink-flowered plant is crossed with a white-flowered plant. Draw and fill out your Punnett square. What is the probability of producing a pink-flowered plant?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

4.

In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W).

A red flowered plant is crossed with a white-flowered plant. Draw and fill out your Punnett square. What is the probability of producing a pink-flowered plant?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

5.

Incomplete Dominance

In Andalusian fowls, black individuals (B) and white individuals (W) are homozygous. A homozygous black bird is crossed with a homozygous white bird. Draw the Punnett square. What fraction of the offspring would be heterozygous (displaying a phenotype of bluish feathers)?

a)

0/4

b)

1/4

c)

2/4

d)

3/4

e)

4/4

6.

Incomplete dominance

In Andalusian fowls, black individuals (B) and white individuals (W) are homozygous. Heterozygous birds show a blueish phenotype. If a black individual is crossed with a bluish-gray individual, what percent of the offspring would show black feathers?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

7.

Incomplete Dominance

In Andalusian fowls, black individuals (B) and white individuals (W) are homozygous. Heterozygous birds show a blueish phenotype. If a black individual is crossed with a bluish-gray individual, what percent of the offspring would show bluish feathers?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

8.

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). Match the following genotypes to their phenotypes

a)

BB

1.

Black feathers

b)

WW

2.

White feathers

c)

BW

3.

Erminette (Black and white feathers)

9.

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted).

Two erminette chickens (BW) were crossed. What percent of their offspring would have black feathers?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

10.

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted).

Two erminette chickens (BW) were crossed. What percent of their offspring would have white feathers?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

11.

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted)

A black chicken and a white chicken are crossed. Show the Punnett Square. What is the probability that they will have erminette (BW) chicks?

a)

0/4

b)

1/4

c)

1/2

d)

3/4

e)

4/4

12.

In shorthorn cattle, when a red bull (RR) is crossed with a white cow (WW), all the offspring are roan(RW)-a spotted, red and white or milky red color. What is the genotypic ratio for the offspring from mating a red bull and a roan cow?

a)

1 RR: 2 RW: 1 WW

b)

2 RR: 2 RW

c)

3 RR: 1 WW

d)

All RW

13.

In shorthorn cattle, when a red bull (RR) is crossed with a white cow (WW), all the offspring are roan(RW)-a spotted, red and white or milky red color. What is the phenotypic ratio for the offspring from mating a roan bull and a roan cow?

a)

1 RR: 2 RW: 1 WW

b)

2 RR: 2 WW

c)

3 RR: 1 WW

d)

All RW

Incomplete and Codominance Practice

Total questions: 13

Worksheet time: 13mins

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