Down Syndrome Karyotype
Down syndrome is characterized by trisomy 21, which is an extra chromosome 21 (see arrow).
L. WILLATT, EAST ANGLIAN REGIONAL GENETICS SERVICE/SCIENCE PHOTO LIBRARY
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Down syndrome is characterized by trisomy 21, which is an extra chromosome 21 (see arrow).
L. WILLATT, EAST ANGLIAN REGIONAL GENETICS SERVICE/SCIENCE PHOTO LIBRARY