IB skill practice

Explain hormones and reproductive biology

Paper 1, Paper 2 5 marks Difficulty 4

Explain fertilisation outcome

A reproductive biology model in a neurobiology tutorial shows one sperm nucleus joining with one egg nucleus. State the outcome and why chromosome number is restored. Enter the answer and choose the interpretation that best matches the biological evidence.

Worked practice: biological evidence and answer

Use the labelled biological evidence first, then connect it to the final answer.