Genetic drift is a mechanism of evolution.

1. GENETIC DRIFT
CHITHRA S
EVOLUTION
CSIR NET

2. What is Genetic Drift?
 Genetic drift is a mechanism of evolution responsible for random
changes in a gene pool
 Genetic drift is the change in frequencies of alleles in a
population due to chance
 Happens to all population
 But its effects tend to be stronger in small populations
 Genetic drift tends to reduce genetic variation through losses of
alleles

3.  Genetic drift may result in the loss of some alleles (including
beneficial ones) and the fixation of other alleles. That means, a
beneficial allele may be lost, or a slightly harmful allele may become
fixed, purely by chance

4. Two Types of Genetic Drift
Genetic Drift
Bottle Neck Effect
(Disaster)
Founder Effect
(Migration and new
colony formation)

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