Question
Explain the Genetic drift.
✓
Answer
- Genetic drift is random, directionless fluctuation that takes place in allele frequency.
- It occurs by pure chance, in small sized population.
- Genetic drift becomes an evolutional factor as it can change the gene frequency.
- Sewall wright has given this concept and hence it is also known as Sewall wright effect.
- Due to genetic drift, some alleles of a population are lost or reduced by chance and some others may be increased.
- Some time, a few individuals become isolated from the large population and they produce new population in new geographical area.
- Genetic drift is also called founders’ effect because original drifted population becomes ‘founders’ in the new area.
E.g. Non-adaptive character of huge horns in Antelope is fixed due to genetic drift.
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