A couple has two children with a genetic disease.What is the probability that the next child will have the same genetic disease?

Question

Quizplus · Accepted Answer

Affected heterozygous individuals transmit the trait to approximately half of their children, but because gamete transmission is subject to chance fluctuations, it is possible that all or none of the children of an affected parent may have the trait. When large numbers of matings of this type are studied, however, the proportion of affected children will closely approach one half.

A Couple Has Two Children with a Genetic Disease