homozygous by descent

ho·mo·zy·gous by de·scent

(hō'mō-zī'gŭs dē-sent'), Possessing two identical alleles at a given locus that are descended from a single source, as may occur in consanguineous mating.

ho·mo·zy·gous by de·scent

(hō'mō-zī'gŭs dĕ-sent') Possessing two genes at a given locus that are descended from a single source, as may occur in consanguineous mating.