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Why are human sex cells haploid? Why do they contain 23 chromosomes?

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Why are human sex cells haploid? Why do they contain 23 chromosomes?

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Meiosis occurs in humans and other kinds of organisms. When it occurs in humans, each diploid cell that undergoes meiosis contains 46 chromosomes (44 autosomes + 2 sex chromosomes). As a result of meiosis, four haploid daughter cells are formed, the sex cells, each with 23 chromosomes (22 autosomes + 1 sex chromosomes). Therefore, at fertilization, the haploid (23N) nucleus of the sperm and and the haploid (23N) nucleus of the egg fuse to form a diploid (46N) zygote (which is a fertilized egg that will eventually develop into a baby, if all goes well).

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