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It occurs at the upper part of the oviduct after copulation.
Sperms are drawn by the cervix to the uterus.Sperms swim up to the oviduct using their tails.
When a sperm comes into contact with the egg,the acrosome bursts releasing lytic enzymes that dissolve the egg membrane.
The acrosome then turns inside-out forming a fine filament that penetrates the egg.The head of the sperm enters the ovum while the tail is left behind.
Vitelline membrane undergo certain changes that prevents further entry of sperms to the ovum.
Male nucleus fuses with the female nucleus forming a diploid zygote.The zygote undergoes a series of mitotic division forming blastocytes.The latter develop villi which grow into the endometrium.The villi together with the endometrium form the placenta.The blastocytes become the embryo after implantation which takes place in thee uterus.
The zygote moves from uterus to oviduct by cilia movements and contractions of smooth muscles along the oviduct.
otienosam answered the question on June 25, 2019 at 17:38
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