In which situation can a child born with a genetic disease have two normal parents?

Question

Quizplus · Accepted Answer

If the disease gene is recessive, then the child can only get the disease if they inherit two copies of the mutated gene, one from each parent. If both parents are heterozygous carriers (meaning they have one normal and one mutated gene), there is a 25% chance that their child will inherit two mutated copies and have the disease. Therefore, two normal parents can have a child with a genetic disease if they are both carriers of a recessive gene mutation.

In Which Situation Can a Child Born with a Genetic