The ultimate source of all changes is:
Correct answer: A. Mutation
- A. Mutation
- B. Migration
- C. Genetic drift
- D. Change in allele frequency
Explanation
The ultimate source of all genetic variation is mutation. The mutation is important as the first step of evolution because it creates a new DNA sequence for a particular gene, creating a new allele.
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About Evolution
Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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