O-LevelBiologyGenetics & Variation5090/11 · Oct/Nov 2012 · Q331 Mark

The diagram represents gametes P and Q fusing to give cell R. Cell R then produces gametes S, T, U and V. Which statement about the numbers of chromosomes in the cells and gametes is correct?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AThe numbers of chromosomes in P and Q are different.

BThe numbers of chromosomes in P and S are the same.

CThe number of chromosomes in S is one quarter of the number of chromosomes in R.

DThe number of chromosomes in T is half the number of chromosomes in Q.

✓ Correct answer

B: The numbers of chromosomes in P and S are the same.

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2012 Paper 1 Variant 1, question 33.

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