O-LevelBiologyGenetics & Variation5090/12 · May/June 2020 · Q381 Mark
A farmer uses sperm from a black male sheep to artificially inseminate (fertilise) 20 light brown female sheep. All of the offspring produced were black. Which statement explains these results?
AThe alleles for light brown colour are dominant.
BThe male sheep is heterozygous and the allele for black colour is dominant.
CThe male sheep is homozygous and the allele for black colour is codominant.
DThe male sheep is homozygous and the allele for black colour is dominant.
✓ Correct answer
D: The male sheep is homozygous and the allele for black colour is dominant.
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