Some problems represent a non–X-linked recessive trait. Inheritance of Single-Gene Problems

Some problems represent a non–X-linked recessive trait. Inheritance of Single-Gene Problems

A person usually must receive two abnormal genes, one from each parent to have the disorder. Neither parent has the disorder but each has a 50% chance of passing the abnormal gene to the children if both parents carry one abnormal gene and one normal gene. Therefore, each young son or daughter has

A 25% possibility of inheriting two unusual genes (and so of developing the condition)

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