Letter A

Autosomal

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Pertaining to a chromosome that is not a sex chromosome; relating to any one of the chromosomes save the sex chromosomes.

People normally have 22 pairs of autosomes (44 autosomes) in each cell together with two sex chromosomes (X and Y in the male and XX in the female).

<U>Examples:</U> An autosomal gene is a gene on an autosome.

Most single genes describe an autosomal pattern of inheritance.

Huntington disease is an autosomal dominant trait.

Cystic fibrosis is an autosomal recessive trait.

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