O-LevelBiologyGenetics & Variation5090/21 · May/June 2020 · Q710 Marks
Describe how changes in gene structure may be caused.
- (a)Describe how changes in gene structure may be caused.[3]
- (b)Explain how changes in gene structure may eventually lead to the evolution of a species.[7]
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [3] radiation; chemicals; mutation;
- [7] cause changes in appearance / phenotype ; variation; change in environment ; advantage; survival; natural selection ; reproduction; inheritance; over a period of time ; breed only with similar type / separate species AW ;
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