Alleles and Appearance – Check Test

1. A dominant allele

A is bigger than a recessive allele.

B is usually represented by a small letter.

C always shows up in the phenotype.

D is masked by a recessive allele.

2. A recessive allele

A shows up in a homozygous individual.

B never shows up in the phenotype.

C always shows up in the phenotype.

D shows up in a heterozygous individual.

3. The genotype of an organism

A describes its appearance.

B is written in words.

C is determined by its phenotype.

D is the combination of its alleles.

4. The phenotype of an organism is

A a combination of alleles.

B masked by the genotype.

C represented by letters.

D what it looks like.

5. In a homozygous organism

A only dominant alleles are present.

B both alleles are identical.

C only recessive alleles are present.

D both alleles are different.

6. In a heterozygous organism the alleles present are

A both the same.

B different.

C both dominant.

D both recessive.

Questions 7 and 8 refer to the following information.

In mice, black coat (B) is dominant to white coat (b).

7. A mouse with the genotype bb is

A homozygous dominant.

B black.

C homozygous recessive.

D heterozygous.

8. A mouse with the genotype Bb

A will be black.

B is homozygous.

C will be white.

D will be black and white.