With respect to this gene, it is reasonable to predict that the cross
A - VCE - SSCE Biology - Question 6 - 2002 - Paper 1
Question 6
With respect to this gene, it is reasonable to predict that the cross
A. SS x SS results in both solid-coloured and white-saddle cattle.
B. Ss x Ss results in both s... show full transcript
Worked Solution & Example Answer:With respect to this gene, it is reasonable to predict that the cross
A - VCE - SSCE Biology - Question 6 - 2002 - Paper 1
Step 1
A. SS x SS results in both solid-coloured and white-saddle cattle.
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Answer
This cross would lead to all offspring being solid-coloured because the dominant allele 'S' masks the effects of the recessive allele 's'.
Step 2
B. Ss x Ss results in both solid-coloured and white-saddle cattle.
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Answer
This is the correct prediction. The cross can produce SS, Ss, and ss offspring. This would mean that both solid-coloured (SS, Ss) and white-saddle (ss) cattle result from these crosses.
Step 3
C. SS x SS results in only solid-coloured cattle.
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Answer
This statement is true, but it doesn’t address the potential for white-saddle cattle. All offspring would indeed be solid-coloured.
Step 4
D. ss x ss results in only white-saddle cattle.
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Answer
This is also true as all offspring would be recessive and display the white-saddle phenotype. However, it does not account for the other genotypes produced in the earlier crosses.
