PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
FISH (fluorescence in-situ hybridisation) light micrograph of human chromosomes during metaphase of cell division (mitosis). Humans have 46 chromosomes in total: 23 inherited from the mother and 23 from the father. The sex chromosomes, which determine gender, are XX (female) and XY (male).
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