# Explain why sexual reproduction generates greater genetic variation in offspring than asexual reproduction.

> IB DP Biology Standard Level (2023 syllabus) — D3.1 Reproduction · Explain · 4 marks

## Mark scheme (4 marks)

1. Sexual reproduction involves the fusion of two gametes (fertilisation), combining genetic material from two parents
2. Meiosis produces genetically unique gametes through independent assortment of homologous chromosomes
3. Crossing over during meiosis I produces recombinant chromosomes, generating new allele combinations
4. Asexual reproduction produces offspring that are genetically identical to the parent (clones), as only mitosis is involved and there is no fusion of gametes

## Key terms

- [sexual reproduction](https://www.gradenine.co.uk/glossary/sexual-reproduction)
- [asexual reproduction](https://www.gradenine.co.uk/glossary/asexual-reproduction)
- [genetic variation](https://www.gradenine.co.uk/glossary/genetic-variation)

## Related

- [Revision notes for IB DP Biology Standard Level (2023 syllabus)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/explain-why-sexual-reproduction-generates-greater-4696a7af) · Published by Druglandscape Ltd.