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5 marksNatural Selection

CAPE Biology Unit 1 · 2003 · Paper 2 · Question 3(a)(ii)

Table 1 contains data on the typical birth-weight of babies over a period of 10 years. The mortality of babies, in relation to birth-weight is shown in Table 2. Use the data in Tables 1 and 2 to answer questions (a) (i) and (ii).

Also on Figure 3, construct a graph of the percentage mortality of babies in relation to birth-weight. (Use a best-fit graph line.)

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 3(a)(i)On Figure 3, complete the histogram of the typical birth-weight of babies over a 10-year period. (Note that portions of this histogram have been pre-drawn.)[5 marks]
  2. 3(b)With reference to the graphs drawn on page 10, comment on the effect of birth-weight on mortality.[3 marks]
  3. 3(c)What effect would the observations you made in (b) have on the gene pool controlling the birth-weight of the foetus?[1 mark]
  4. 3(d)What is this type of selection called?[1 mark]

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