Biology · May / June 2025 · Paper 21 · Question 2
5090
As printed in the paper
Show the answer and mark scheme
2(a)(i)[1]
2(a)(ii)[2]
2(a)(iii)[2]
2(b)(i)[2]
2(b)(ii)[4]
some water shrews have more of the protein / a mutation occurred (producing the protein);
water shrews compete for food;
shrews with the protein can collect more food;
these shrews are more likely to survive;
these shrews are more likely to reproduce;
they pass on the alleles (for the protein) to the next generation (max 4)
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