Incestuous matings among parents of mental defectives.
D001686:Biological Phenomena; D040941:Heredity; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D010262:Paraphilic Disorders; D010290:Parents; D010829:Physiological Phenomena; D012725:Sexual Behavior / Q000523:psychology*
HEREDITY; MENTAL DEFICIENCY/heredity; SEXUAL DEVIATION