JAMES CAVALLINI / SCIENCE PHOTO LIBRARY JAMES CAVALLINI / SCIENCE PHOTO LIBRARY
Colour enhanced male karyotype. The human karyotype is composed of 23 pairs of chromosomes, including 1 pair of sexual chromosomes: XY for man as shown here, and xx for woman. The chromosomes carry genetic information, and are formed by a long DNA molecule associated with proteins. Illustration of Microscopy. Magnification 3900x per 10 cm.
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