Mammalian genetics.
D000818:Animals; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002874:Chromosome Mapping; D002891:Chromosomes, Human, Pair 21; D030342:Genetic Diseases, Inborn / Q000235:genetics*; D005828:Genetics, Population; D015894:Genome, Human; D006801:Humans; D014960:X Chromosome; D014998:Y Chromosome