defined:

An individual who possesses one copy of a mutant allele that causes disease only when two copies are present. Although carriers not affected by the disease, two carriers can produce a child who has the disease.

explained:

Listen to a detailed explanation. (Requires the free RealPlayer download)

Dr. Danilo Tagle, formerly of the National Human Genome Research Institute's Genetics and Molecular Biology Branch, defines carrier.

related
terms:

allele, mutation, heterozygous, homozygous

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