In humans, the long eyelash allele dominates over the short eyelash allele. A woman with long eyelashes

In humans, the long eyelash allele dominates over the short eyelash allele. A woman with long eyelashes, whose father had short eyelashes, married a man with short eyelashes. What is the probability of giving birth to a child with long eyelashes in this family? What genotypes can children in this family have?

Let’s designate the gene that causes the development of long eyelashes in humans as P, then the gene for short eyelashes will be designated as p.

The woman’s father had short eyelashes, therefore, possessed the pp genotype, because this trait can be realized in the phenotype only if it is homozygous.

He produced one type of sperm – p, and he could only pass on the gene for short eyelashes to his daughter.

Since a woman has long eyelashes, it should be concluded that her genotype is heterozygous – Pp. It produces p and p eggs.

The man, like the woman’s father, has short eyelashes and the pp genotype. The sperm produced by it – p.

In this family, the birth of offspring of the following type should be expected:

children with long eyelashes (PP) – 50%;

children with short eyelashes (pp) – 50%.