| Genetic
variability |
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| ‥ Mutation and evolution: |
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| 1. Base
substitution |
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| 2.
The insertion or deletion of single bases |
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| 3.
Inversion of a section of DNA; Recombination |
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| (Intragenic inversion; chromosomal
inversion) |
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| 4.
Duplication or deletin of a section of the DNA |
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| **The
balance between mutation and selection |
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| **Deleterious
(Lethal) mutation |
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