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6 marksNatural Selection

CAPE Biology Unit 1 · May/June 2022 · Paper 2 · Question 2(c)(ii)

John Endler's 1970 experiment on male coloration in guppies under different predation conditions across ponds A, B, and C over a 20-month period.

Using the information given on page 14, discuss how the results of John Endler's experiment, as it relates to variation in the number of spots in male guppies, may support THREE of Darwin's deductions regarding natural selection.

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Other parts of this question

  1. 2(a)(i)In the appropriate spaces provided in Figure 3, make detailed sketches to illustrate the TWO key stages of mitosis in the cell that are NOT shown (Stage II and…[2 marks]
  2. 2(a)(ii)State the name of the missing stages: Stage II, Stage III, Stage IV.[3 marks]
  3. 2(a)(iii)Explain how the process of mitosis ensures that each daughter nucleus receives a full set of chromosomes.[3 marks]
  4. 2(b)(i)Define the term 'natural selection'.[2 marks]
  5. 2(b)(ii)List THREE of Darwin's observations concerning natural selection.[3 marks]
  6. 2(c)(i)On the grid provided on page 15, plot a line graph to represent the data in Table 1 for Pond A, Pond B and Pond C.[5 marks]

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