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Karyotype of Chromosomes In Down's Syndrome
12" x 16"
Photographic Print

Karyotype showing the arrangement of chromosomes in a male with Downs syndrome trisomy the most common diagnosable cause of mental handicap Downs syndrome is caused by a chromosomal anomaly the st set having three rather than the normal two chromosomes In karyotyping chromosomes are arranged in numbered pairs according to a standard classification The male set differs from the female in the sex pair bottom right a female would have XX rather than XY A male Downs karyotype is written XY The normal chromosome count is from maternal and from paternal origin