A-level BIOLOGY Paper 3,. 100% EXAMINABLE QUESTIONS AND ANSWERS.

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Answer all questions in this section. You are advised to spend no more than 1 hour and 15 minutes on this section. 0 1 Guppies are small fish. Female guppies are dull in colour. Male guppies can be ... bright or dull in colour. Scientists investigated the effect of female brain size on choosing a mate. They used laboratory-bred female guppies with large brains and with small brains. They set up a fish tank as shown in Figure 1. Figure 1 They observed each female for 10 minutes and recorded which male they were attracted towards. They repeated this with 45 large-brained females and 45 small-brained females. 0 1 . 1 Suggest three possible limitations of this investigation. [3 marks] 1 2 3 [Show More]

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