O-LevelBiologyGenetics & Variation5090/11 · Oct/Nov 2011 · Q371 Mark

A recessive homozygote is crossed with a heterozygote of the same gene. What will be the phenotypes of the F₁ generation?

Aall dominant

B75% dominant, 25% recessive

C50% dominant, 50% recessive

D25% dominant, 50% heterozygous, 25% recessive

✓ Correct answer

C: 50% dominant, 50% recessive

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2011 Paper 1 Variant 1, question 37.

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