Write a note on “Genetic drift”.

Answer: Genetic Drift.

i. Any alteration in allele frequency in the natural population by pure chance is called genetic drift.
ii. For example, elimination of a particular allele from a population due to events like accidental death prior to mating of an organism.
iii. Genetic drift occurs when the sole possessor of a particular allele is removed from the population.
iv. It is also called Sewall Wright effect.

Describe any two biological evidences of evolution.

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