Sperm and fertilization


On the other hand, the gelatinous coats that surround the eggs of many animals exert a trapping action on spermatozoa, thus increasing the chances for successful sperm-egg interaction. A typical IVF procedure begins with egg collection.

Sperm and fertilization

For example, a woman may produce normal eggs, but the eggs cannot reach the uterus because the uterine tubes are blocked or otherwise compromised. The sperm nucleus then fuses with the ovum, enabling fusion of their genetic material.

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The pronuclei then migrate toward each other, their nuclear envelopes disintegrate, and the male- and female-derived genetic material intermingles.

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How pregnancy *actually* happens

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