4 Domestic goats, Capra hircus, show a wide range of coat patterns and colours. One gene involved
in coat colour and pattern has multiple alleles. Four of these alleles are:
•
A, the allele for white, is dominant to all others
•
Ab, the allele for badgerface (stripes on face) and Aº, the allele for grey, are codominant
•
a, the allele for black, is recessive to all others.

Q: What topic does this question test?

This question tests Inherited change in A-Level Biology (syllabus code 9700). It is worth 8 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology May/June 2018 examination, Paper 4 Variant 1 (9700_s18_qp_41.pdf).

Question

4 Domestic goats, Capra hircus, show a wide range of coat patterns and colours. One gene involved
in coat colour and pattern has multiple alleles. Four of these alleles are:
•
A, the allele for white, is dominant to all others
•
Ab, the allele for badgerface (stripes on face) and Aº, the allele for grey, are codominant
•
a, the allele for black, is recessive to all others.

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