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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. 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 irregular genes (and so of developing the condition)

A 25% possibility of inheriting two normal genes

A 50% potential for inheriting one normal and something unusual gene (hence becoming a provider regarding the condition such as the moms and dads)

Consequently, among the list of young kiddies, the possibility of not developing the disorder (this is certainly, being normal or even a provider) is 75%.

In cases where a gene is X-linked, it’s current from the X chromosome. Recessive X-linked problems often develop only in men. This male-only development does occur because men have just one X chromosome, generally there is not any paired gene to counterbalance the effect of the gene that is abnormal. […]

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