O-LevelBiologyGenetics & Variation5090/11 · May/June 2013 · Q371 Mark

The genotype for the height of an organism is written as Tt. What conclusion may be drawn?

AThe allele for height has at least two different genes.

BThere are at least two different alleles of the gene for height.

CThere are two different genes for height, each having a single allele.

DThere is one allele for height with two different forms.

✓ Correct answer

B: There are at least two different alleles of the gene for height.

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2013 Paper 1 Variant 1, question 37.

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