PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Human female karyotype. G-banded karyotype of a normal human female (XX). The karyotype is the complete set of chromosomes in an organism. Humans have 46 chromosomes in total: 23 inherited from the mother and 23 from the father. The sex chromosomes (X and Y, bottom right) determine gender - the XX chromosome pair indicates that this person is female. Males have an XY chromosome pair instead - here, the space for a Y chromosome is empty (bottom right).
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