| Front | List the sequence of events that takes place in a fertilisation reaction |
|---|---|
| Back | Sperm cells arrive at the egg, follicle cells release chemicals to trigger an acrosome reaction (where the acrosome swells, fusing with the sperm surface membrane and the acrosome releases digestive enzymes to break down ovum's follicle cell layer and zona pellucida), the sperm membrane fuses with the ovum membrane and the sperm nucleus enters the ovum, lysosomes in ovum release cortical granules which release enzymes at the ovum membrane to trigger a cortical reaction (zona pellucida thickens to prevent more sperm entering), finally the two haploid nuclei fuse to form a zygote |
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