A sperm cell and an ovum each contribute 23,rather than 46,chromosomes to a zygote because they

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Sperm cells and ova are produced by the process of meiosis, which results in the division of a diploid cell into four haploid cells. This means that each sperm or egg only has 23 chromosomes instead of the usual 46 found in other body cells. When a sperm and an egg fuse during fertilization, they each contribute 23 chromosomes to form a zygote with a total of 46 chromosomes.

A Sperm Cell and an Ovum Each Contribute 23,rather Than