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This was a question on the 2016 Toronto Biology Exam, precisely question 42. Though the question was asked vaguely, d is the best answer. It's quite obvious that if animals are in water, fins will eventually evolve to improve fitness, that's pretty obvious. However, if they are both in water, why are their fins different? This touches on the more complex ...


As alluded to in the comments above, remember that you are amplifying double-stranded DNA, so two new reverse-complementary strands should be generated from each cycle (so that they can hybridize with eachother). As written in your answer, both of your primers would hybridize with your given strand, and the amplicons would not overlap (one binds at each end, ...

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