DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.b.ii

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Date November 2020 Marks available [Maximum mark: 4] Reference code 20N.2.SL.TZ0.b.ii
Level SL Paper 2 Time zone TZ0
Command term Explain Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 4]
20N.2.SL.TZ0.b.ii

Explain how evolution by natural selection depends on mutations.

[4]

Markscheme

a. mutations cause variation among organisms of same species/population;

b. some variations/mutations make individual more suited to its environment/way of life;

c. individuals that are better adapted survive and produce offspring;

d. individuals pass on genetic characteristics/mutation/variation to offspring;

e. natural selection increases frequency of characteristics/alleles that make individuals better adapted;

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