D3.1.6—Fertilization in humans Topic Practice
D3.1.6—Fertilization in humans Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise the core event of human fertilization, focusing on what happens to sperm and egg nuclei after the sperm enters the egg.
How this is tested
- distinguish fertilization events from meiosis or inheritance distractors in MCQs
- explain that sperm and egg nuclear membranes break down during fertilization
- apply the sequence of sperm entry and nuclear changes to select the correct outcome
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