Cell BiologyAQA GCSE Biology (8461)

Cell Division

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

Practice progress

5 MCQs

0 of 5 attempted

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1
How many chromosomes are in a normal human body (somatic) cell?
Answer & explanation
Correct: option B
Human body cells are diploid — 46 chromosomes arranged as 23 homologous pairs.
2
How many chromosomes are in a human sperm cell?
Answer & explanation
Correct: option A
Gametes (sperm and egg) are haploid — 23 single chromosomes. Fertilisation restores 46.
3
What is a gene?
Answer & explanation
Correct: option B
A gene is a short stretch of DNA on a chromosome that codes for one protein (or polypeptide).
4
What does 'homologous pair' mean?
Answer & explanation
Correct: option B
A homologous pair = two chromosomes carrying the same genes in the same order; one inherited from each parent. The 23 pairs of human chromosomes are homologous pairs.
5
If a fertilised egg (zygote) has 46 chromosomes, how many came from the sperm?
Answer & explanation
Correct: option B
Sperm and egg are both haploid (23). At fertilisation, 23 + 23 = 46 (diploid).

Cell BiologyAQA GCSE Biology (8461)

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

5 MCQs

0 of 5 attempted

Correct

Incorrect

Remaining

1
How many chromosomes are in a normal human body (somatic) cell?
Answer & explanation
Correct: option B
Human body cells are diploid — 46 chromosomes arranged as 23 homologous pairs.
2
How many chromosomes are in a human sperm cell?
Answer & explanation
Correct: option A
Gametes (sperm and egg) are haploid — 23 single chromosomes. Fertilisation restores 46.
3
What is a gene?
Answer & explanation
Correct: option B
A gene is a short stretch of DNA on a chromosome that codes for one protein (or polypeptide).
4
What does 'homologous pair' mean?
Answer & explanation
Correct: option B
A homologous pair = two chromosomes carrying the same genes in the same order; one inherited from each parent. The 23 pairs of human chromosomes are homologous pairs.
5
If a fertilised egg (zygote) has 46 chromosomes, how many came from the sperm?
Answer & explanation
Correct: option B
Sperm and egg are both haploid (23). At fertilisation, 23 + 23 = 46 (diploid).