IB Biology HL 3.1.6 Fertilization in humans Question Bank
Practise IB Biology HL 3.1.6 by analysing sperm penetration, membrane changes and chromosome fusion during fertilization.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse acrosome and cortical reactions that enable one sperm to fuse with the ovum.
- Evaluate nuclear and membrane changes that prevent polyspermy and form a zygote.
D3.1.6—Fertilization in humans question 1
[Maximum number: 6]
Describe the process of fertilization in humans.
sperm breaks through follicle cells/cells surrounding the ovum; triggers acrosome reaction; proteases/hydrolytic enzymes (of acrosome) released; digestion of zona pellucida; plasma membranes of sperm and egg fuse; sperm nucleus enters egg; cortical reaction; hardening/cross linking of glycoproteins in zona pellucida; preventing sperm from entering;
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