Gametes and fertilisation 0.0 / 5 ? BiologyDNA, genetics and evolutionHuman, animal and plant physiologyASEdexcel Created by: madddCreated on: 30-05-17 16:21 Name the two gametes Sperm cells and egg cells 1 of 6 Number of chromosomes contained by both gametes 23 2 of 6 Describe and explain the structure of the sperm cell Acrosome enzymes to digest the zona pellucida; midpiece contains ATP to provide energy for movement; flagellum allows the sperm to swim to egg 3 of 6 Describe and explain the structure of the egg cell Zona pellucida contains glycoprotein layer to protect the egg; follicle cells 4 of 6 Describe the acrosome reaction Release of digestive enzymes from the acrosome; digestion of zona pellucida; fusion of sperm with egg cell membrane; egg releases cortical granules 5 of 6 Suggest how smoking affects male fertility Decrease in sperm motility; poor movement prevents fertilisation; damage to DNA 6 of 6
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