The gene that causes diabetes mellitus is reactive to the normal gene. Healthy spouses had a child with diabetes

The gene that causes diabetes mellitus is reactive to the normal gene. Healthy spouses had a child with diabetes. 1) how many types of gametes can a father develop? 2) How many types of gametes can a mother develop? 3) what is the probability (in%) of the birth of a healthy child in this family? 4) How many different genotypes can there be among the children of this married couple? 5) What is the probability (in%) B that the second child in this family will also suffer from diabetes?

The gene that causes diabetes is recessive to the normal gene. If a sick child was born to healthy parents, then they were heterozygous for the genotype.

Let A be the norm and a diabetes.

RR f Aa (n) x ma aa (d)

m / f A a A AA (n) Aa (n) a Aa (n) aa (e)
Answer:

With this genotype, gametes of 2 varieties are formed in both the father and the mother.
The probability of having a healthy child is 75%.
In children, genotype splitting is possible in a 1: 2: 1 ratio.
The likelihood of having a second child with diabetes is 25%.