Fig. 5.1 shows a cat displaying the recessive phenotype for two unlinked genes.
• H/h controls hair length. The allele for short hair is dominant to the allele for long hair.
• R/r controls coat pattern. The allele for 'full colour', with pigment on all parts of the body, is dominant to the allele for 'pointed', where the pigment is restricted to the ears, face, paws and tail.
[Figure 5.1]

Q: What topic does this question test?

This question tests Inherited change in A-Level Biology (syllabus code 9700). It is worth 10 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology Oct/Nov 2020 examination, Paper 4 Variant 3 (9700_w20_qp_43.pdf).

Question

Fig. 5.1 shows a cat displaying the recessive phenotype for two unlinked genes.
• H/h controls hair length. The allele for short hair is dominant to the allele for long hair.
• R/r controls coat pattern. The allele for 'full colour', with pigment on all parts of the body, is dominant to the allele for 'pointed', where the pigment is restricted to the ears, face, paws and tail.
[Figure 5.1]

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