Question 63
An example of natural selection is the peppered moth in 19th-century England. There are two varieties of peppered moths – the pale form and the dark-coloured melanic form (Figure 3.42).
Figure 3.41 summarises: individuals vary because of differences in DNA; more offspring are produced than can survive; competition, predation and disease affect survival; favourable inherited variations improve survival and reproduction; over time favourable traits become more common.
Refer to Figure 3.41. Use the main points of the theory of natural selection to explain how the two varieties of peppered moth were affected in 19th-century England.
Figure 3.41 summarises: individuals vary because of differences in DNA; more offspring are produced than can survive; competition, predation and disease affect survival; favourable inherited variations improve survival and reproduction; over time favourable traits become more common.
Refer to Figure 3.41. Use the main points of the theory of natural selection to explain how the two varieties of peppered moth were affected in 19th-century England.
