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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. If both moms and dads carry one unusual gene plus one normal gene, neither moms and dad gets the disorder but each possesses 50% possibility of moving the unusual gene towards the young ones. Consequently, each son or daughter has

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

A 25% possibility of inheriting two genes that are normal

A 50% potential for inheriting one normal plus one unusual gene (therefore becoming a provider for the condition just like the moms and dads)