PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Human male karyotype. M-FISH (fluorescence in-situ hybridisation) light micrograph of the normal human male karyotype (XY). 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), which determine gender, are at bottom right - here, the XY chromosome pair indicates that this person is male.
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