O-LevelBiologyGenetics & Variation5090/11 · May/June 2019 · Q381 Mark

Which row shows the sex chromosomes when parents have a baby boy?

Ain the egg cell: X, in the sperm cell: X, in the zygote: XX

Bin the egg cell: X, in the sperm cell: Y, in the zygote: XY

Cin the egg cell: Y, in the sperm cell: X, in the zygote: XY

Din the egg cell: Y, in the sperm cell: Y, in the zygote: YY

✓ Correct answer

B: in the egg cell: X, in the sperm cell: Y, in the zygote: XY

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2019 Paper 1 Variant 1, question 38.

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