This is a complete and an all-inclusive guide to AQA A-LEVEL BIOLOGY
PAPER 3 2020 QP.
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 f...
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A-level
BIOLOGY
Paper 3
Monday 15 June 2020 Morning Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
• a ruler with millimetre measurements
Question Mark
• a scientific calculator.
1
Instructions 2
• Use black ink or black ball-point pen.
3
• Fill in the boxes at the top of this page.
• Answer all questions in Section A. 4
• Answer one question from Section B. 5
• You must answer the questions in the spaces provided. Do not write 6
outside the box around each page or on blank pages.
7
• If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). TOTAL
• Show all your working.
• Do all rough work in this book. Cross through any work you do not want
to be marked.
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 78.
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Do not write
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Section A box
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
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3
Do not write
outside the
Guppies with large brains are better at identifying predators. box
The scientists found that only female guppies with large brains were attracted to
male guppies bright in colour.
0 1 . 2 Suggest and explain the advantage of this behaviour to the population of guppies.
[3 marks]
0 1 . 3 Describe how the behaviour of female guppies could result in sympatric speciation.
[3 marks]
9
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