vanem (ingl. Parent) Ristamisel osalev vanemorganism. Sarnased vasted sorteeriv ristamine (ingl. Assortative mating) retsiprookne ristamine (ingl. Reciprocal cross) monohübriidne ristamine (ingl. Monohybrid cross) mittejuhuslik ristamine (ingl. Nonrandom mating) hübriidimine (ingl. Hybridization)