IB skill practice

Explain hormones and reproductive biology

Paper 1, Paper 2 5 marks Difficulty 3

Explain fertilisation outcome

A reproductive biology model in a plant transport investigation shows one sperm nucleus joining with one egg nucleus. State the outcome and why chromosome number is restored. Use the diagram labels, physiology pathway, feedback loop, or data values before answering. Enter the answer and choose the interpretation that best matches the biological evidence.

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