PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
FISH (fluorescence in-situ hybridisation) light micrograph of the human male karyotype (XY), the complete set of chromosomes. Humans have 46 chromosomes in total: 23 inherited from the mother and 23 from the father. The sex chromosomes, which determine gender, are at bottom right, showing one X and one Y chromosome.
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