HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Light micrograph of the human female karyotype (XX), 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 two XX chromosomes for a female.
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