A carrier of a genetic disease has one copy of an autosome with a recessive allele for a particular trait, but is unaffected by it.

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A carrier of a genetic disease has one copy of an autosome with a recessive allele for a particular trait, but does not show symptoms of the disease because the dominant allele masks the effects of the recessive allele. This means that the carrier can pass on the recessive allele to their offspring, who may also be carriers, but would only express the disease if they inherit two copies of the recessive allele (one from each parent).

A Carrier of a Genetic Disease Has One Copy of an Autosome