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23.6 x 26.9 cm ⏐ 9.3 x 10.6 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
X and Y chromosomes, coloured scanning electron micrograph (SEM). Humans have 46 chromosomes in total: 23 inherited from the mother and 23 from the father. These sex chromosomes determine the individual's gender. Males have an X sex chromosome (pink) and a Y sex chromosome (blue) and females have two X sex chromosomes.
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