O-LevelBiologyGenetics & Variation5090/11 · Oct/Nov 2018 · Q391 Mark

In a species of plant, the allele for yellow flowers is dominant to the allele for white flowers. Which offspring is it possible to produce from a cross between two plants heterozygous for flower colour?

Aheterozygous yellow and heterozygous white

Bheterozygous yellow only

Cheterozygous yellow, homozygous yellow and homozygous white

Dhomozygous yellow only

✓ Correct answer

C: heterozygous yellow, homozygous yellow and homozygous white

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2018 Paper 1 Variant 1, question 39.

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