Fertilization involves the fusion of male and female gametes. For fertilization to occur, sperm undergo two changes after ejaculation: capacitation and the acrosome reaction. Capacitation is a conditioning process that occurs in the female reproductive tract over approximately 7 hours, removing proteins from the sperm membrane and allowing it to undergo the acrosome reaction upon contact with the egg's zona pellucida. The acrosome reaction then allows sperm to penetrate and fertilize the egg.

1. Fertilization is the process by which
male and female gametes fuse.

2.  ampullary region of the uterine tube

4.  Freshly ejaculated Spermatozoa unable to
fertilize the oocyte it undergo 2 changes
 to fertilize the ova
 (a) capacitation
 (b) acrosome reaction

5.  ``Capacitation is a period of conditioning in the
female reproductive tract``
 lasts approximately 7 hours.
 occurs in the uterine tube
 Much of this conditioning, entails epithelial
interactions between the sperm and mucosal
surface of the tube.
 During this time, a glycoprotein coat and seminal
plasma proteins are removed from the plasma
membrane that overlies the acrosomal region of
the spermatozoa.
 Only capacitated sperm can pass through the
corona cells and undergo the acrosome reaction.


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8. 1. Restoration of the diploid number of
chromosomes.
2. Determination of the sex of the new
individual.
3. Initiation of cleavage.
4. Trasportation of gentic features of
parentes.
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9. The Acrosomal Reaction
Caused by interaction of the sperm with molecules of the
zona pellucida
Interaction between sperm and egg is species specific