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carrier
An individual who possesses one copy of a mutant allele that causes disease only when two copies are present. Although carriers are not affected by the disease, two carriers can produce a child who has the disease.
In the case of an infectious disease, a carrier is a person who carries the agent, such as a virus, reponsible for the disease, while often remaining quite wll.
Related categories
• GENETICS AND HEREDITY
• HEALTH AND DISEASE
Source: National Human Genome Research Institute
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