A homozygous chromosomal variant.
D000293:Adolescent; D002869:Chromosome Aberrations; D002902:Chromosomes, Human, 16-18; D005260:Female; D006801:Humans; D007713:Klinefelter Syndrome / Q000235:genetics; D007962:Leukocytes / Q000166:cytology; D008297:Male; D010375:Pedigree