The diabetes gene is recessive to the normal gene. Healthy spouses had a child with diabetes.

The diabetes gene is recessive to the normal gene. Healthy spouses had a child with diabetes. Determine the genotypes of all family members.

A child in the family has diabetes, which means that he has a homozygous genotype for this trait – that is, it has the formula “aa” (diabetes gene is recessive). The child inherits one gene from each parent. So they have a recessive gene in their genotype – diabetes. But phenotypically they are healthy, i.e. there is a dominant normal state gene in the genotype. This means that all family members have the following types of genotypes:

Mother and father each: Aa (where “A” is a healthy state, “a” is a diabetes gene) child: “aa”.