O-LevelBiologyGenetics & Variation5090/11 · May/June 2016 · Q391 Mark

Two black female mice were mated with the same black male. One female had nine offspring, all of which were black. The other female had six black and two white offspring. Which cross represents the parents of the all black family?

Afemale: bb, male: Bb, key: B = allele for black, b = allele for white

Bfemale: Bb, male: Bb, key: B = allele for black, b = allele for white

Cfemale: Bb, male: BB, key: B = allele for black, b = allele for white

Dfemale: BB, male: Bb, key: B = allele for black, b = allele for white

✓ Correct answer

D: female: BB, male: Bb, key: B = allele for black, b = allele for white

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 1, question 39.

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