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This is a light microscope image magnified approximately 1000 times, showing the 23 pairs of chromosomes of a human male. The first 22 pairs of chromosomes look the same down the microscope for men and women. The last pair are the sex chromosomes. The body cells of males have one copy each of the X chromosome and the (much smaller) Y chromosome, while the cells of females typically have two X chromosomes.

 5.2¬†Genes and chromosomes