AQA GCSE Biology · 8461
Specification 4.6.1.2 · Paper 2
- Revise: Meiosis
Having a single set of chromosomes: half the number found in a body cell of the same species.
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GCSE Biology · key term
A cell with one set of chromosomes, containing one chromosome from each pair.
Used by AQA, Edexcel and OCR
Specification 4.6.1.2 · Paper 2
Having a single set of chromosomes: half the number found in a body cell of the same species.
Specification 1.2, 3.3 · Paper 1, Paper 2
Containing one set of chromosomes; human gametes have one copy of each of the 23 chromosome types.
Sperm and egg cells are specialised reproductive cells called gametes. Their nuclei are haploid, meaning that they contain one set of chromosomes. In humans, that is one copy of each of the 23 chromosome types.
When explaining haploid nuclei, connect them to fertilisation: fusion of two haploid nuclei produces a cell with the diploid number of chromosomes.
State all three linked outcomes clearly: meiosis produces four daughter cells; each has half the chromosome number; and they are genetically different haploid gametes.
State the number of chromosome sets, not just the total number of chromosomes: haploid means one set and diploid means two.
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A cell containing one set of chromosomes, which is half the chromosome number of a diploid cell.
Specification B5.1g, B5.1h · Paper 2 (Foundation), Paper 4 (Higher)
Having one set of chromosomes, represented by n.
Revise: Haploid and diploidThe resulting cell therefore has two sets again. This is why the haploid–diploid distinction matters in inheritance.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A cell containing one chromosome from each pair, rather than both members of every pair.