Question

The allele for dimples (D) is dominant to the allele for no dimples (d). A man heterozygous for dimples marries a woman who is homozygous recessive (no dimples).

What are the genotypes and phenotypes
of the parents?

Answer 1

Answer: Father genotype: Dd. Father phenotype: dimples. Mother genotype: dd. Mother phenotype: no dimples.

Explanation: Phenotype is the physical characteristic shown. The father has dimples and the mother doesn't. The genotype is the combination of alleles.

The father is heterozygous, meaning he has a dominant (D) and a recessive allele (d), so his genotype is Dd.

The mother is homozygous recessive, meaning she has two of the recessive allele (d), so her genotype is dd.

Answer 2

Answer: The man's genotype is Dd. Phenotype: The man has dimples.

The woman's genotype is dd. Phenotype: The woman has no dimples.

Explanation: From the information provided above, the man is heterozygous for dimples, which means that he has one dominant allele for dimples (D) and one recessive allele for dimples (d). Therefore, his genotype is Dd.

Since the allele for dimples (D) is dominant to the allele for no dimples (d), the man's phenotype is that he has dimples.

The woman is homozygous recessive, this means that she has two recessive alleles for dimples (d). Therefore the woman's genotype is dd and since the allele for dimples (D) is dominant to the allele for no dimples (d), the woman phenotypically has no dimples.