L. WILLATT, EAST ANGLIAN REGIONAL GENETICS SERVICE / SCIENCE PHOTO LIBRARY L. WILLATT, EAST ANGLIAN REGIONAL GENETICS SERVICE / SCIENCE PHOTO LIBRARY
Male chromosomes. Coloured light micrograph of a normal trypsin/leishman banded male karyotype, the full complement of male chromosomes arranged in numbered homologous pairs. They are numbered 1- 23 from top left to bottom right & are obtained by matching unpaired chromosomes photographed at the metaphase stage of cell division. Each member of a homologous pair is similar in length & banding pattern. Male & female sets differ only in the sex chromosome (bottom right pair); a female is labelled XX: a male XY. Each human cell contains 46 chromosomes, 23 of maternal & 23 of paternal origin. Magnification: x2400 at 6x7cm size.
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