PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Light micrograph of the human female karyotype (XX), the complete set of chromosomes, with R banding. Humans have 46 chromosomes in total: 23 inherited from the mother and 23 from the father. The sex chromosomes, which determine gender, are at middle right, showing two XX chromosomes.
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