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obligate carrier

n. (context genetics English) An individual who may be clinically unaffected but who must carry a gene mutation based on analysis of the family history; this usually applies to disorders inherited in an autosomal recessive and X-linked recessive manner.

Wikipedia
Obligate carrier

An obligate carrier is an individual who may be clinically unaffected but who must carry a gene mutation based on analysis of the family history; usually applies to disorders inherited in an autosomal recessive and X-linked recessive manner.