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

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

To truly have the condition, an individual often must get two irregular genes, one from each moms and dad. 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. Consequently, each son or daughter has

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