Short arm enlargement in acrocentric chromosomes.
D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics; D005260:Female; D005828:Genetics, Population; D006801:Humans; D007621:Karyotyping; D007962:Leukocytes; D008297:Male; D010375:Pedigree; D010641:Phenotype; D014314:Trisomy; D044465:White People