Science (086) — AI-generated practice question

When two individuals reproduce sexually, each contributes their DNA, which would theoretically double the DNA in every new generation. This is prevented by a special cell division called meiosis, which occurs in reproductive organs. Meiosis halves the number of chromosomes and the amount of DNA in germ cells (gametes). When two gametes fuse during fertilisation, the normal DNA content is re-established. Thus, the DNA amount remains constant across generations.

Source: Chapter 7, Section 7.3.1 — Why the Sexual Mode of Reproduction?

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• The examiner expects three key points: (1) the problem — DNA would double each generation, (2) the solution — meiosis halves DNA in germ cells, (3) the outcome — fertilisation restores normal DNA content.
• Use the terms meiosis, germ cells/gametes, and chromosomes for full marks.
• Don't just say "meiosis occurs" — explain what it does (halves DNA) and why that matters (restores normal amount after fertilisation).