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Every 28 or so days a female matures and releases an egg cell. The male can produce sperm cells. During human intercourse (coitus or mating) the sperm cells will reach the egg and only one sperm cell will fuse and enter into the egg for fertilization. The DNA of egg and sperm cells (n+n) unite together to form a zygote (2n) which will be then implanted in the lining of the uterus for embryogenesis (formation of a fetus or baby from single fused cell).

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10y ago

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