Familial occurrence of an abnormal Y chromosome.
D000015:Abnormalities, Multiple; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002819:Chorea / Q000151:congenital; D003241:Consanguinity; D005260:Female; D006801:Humans; D007194:India; D007621:Karyotyping; D008297:Male; D009135:Muscular Diseases / Q000151:congenital; D009896:Optic Atrophy / Q000151:congenital; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D013019:South Africa; D044465:White People