1.) sperm reach the ovum, chemicals released from the cells surrounding the ovum, trigger the acrosome reaction
2.) the acrosome swells fusing with the sperm cell surface membrane
3.) digestive enzymes in the acrosome are released
4.) the enzymes digest through the follicle cells, and the zona pellucida
5.) the sperm fuses with the ovum membrane and enters the ovum
6.) enzyme released from lysosomes in the ovum thicken the zona pellucida, preventing entry to other sperm
7.) nuclei of the ovum and sperm fuse forming a diploid cell (2n)
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