O-LevelBiologyGenetics & Variation5090/11 · May/June 2012 · Q391 Mark

In fruit flies, the allele for an ebony coloured body is recessive to the allele for a grey coloured body. In an investigation, an ebony-bodied fly was crossed with a grey-bodied fly. What will be the body colour of the offspring if the grey-bodied fly was heterozygous?

Aall ebony

Ball grey

Chalf ebony and half grey

Dthree-quarters grey and one-quarter ebony

✓ Correct answer

C: half ebony and half grey

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2012 Paper 1 Variant 1, question 39.

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