¹ Source: wiktionary.com
Medical Definition of Quasidominant
1. Pattern of inheritance that seems due to a dominant trait but, in fact, is due to the mating of a person who has a recessive disorder (with 2 copies of a gene causing the disease) with someone who is an asymtomatic carrier ( and has 1 copy of the same gene buut no symptoms). (12 Dec 1998)