Galactosemia is inherited as an autosomal recessive trait. What is the probability of having sick children

Galactosemia is inherited as an autosomal recessive trait. What is the probability of having sick children, where one is homozygous for the disease gene, and the other is heterozygous for galactosenia.

The solution to the problem can be represented as the following diagram:

P: aa x Aa;

G: a x A, a;

F1: Aa, aa.

Since the galactosemia gene is recessive, the child with the Aa genotype will be healthy, and the child with the aa genotype will be sick.

Thus, the probability of having sick children will be 50%.