Coat colour in cats is controlled by many genes - VCE - SSCE Biology - Question 3 - 2005 - Paper 1
Question 3
Coat colour in cats is controlled by many genes. One gene locus has many alleles, one of which is called the 'Siamese' allele (c<sup>si</sup>). Cats homozygous for t... show full transcript
Worked Solution & Example Answer:Coat colour in cats is controlled by many genes - VCE - SSCE Biology - Question 3 - 2005 - Paper 1
Step 1
A. two Siamese cats.
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Answer
This cross would only produce Siamese offspring as both parents can only pass on the 'si' allele.
Step 2
B. two heterozygous black cats.
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Answer
This cross would produce various combinations, but would not yield equal numbers of Siamese and black cats.
Step 3
C. a homozygous black cat to a Siamese cat.
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Answer
This cross would produce only black cats and Siamese cats, but not in equal numbers.
Step 4
D. a heterozygous black cat to a Siamese cat.
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Answer
This cross would produce both black and Siamese cats in equal proportions, as the heterozygous black cat (C/c<sup>si</sup>) can pass either the C allele or the 'si' allele.
