Genetic Drift

Genetic Drift: Random change in allele frequency causes an allele to become more common or less common.

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Example: T=Tall, t=Short (T:t)

5:7

Only The Three Circled Giraffes Leave Offspring

5:5

Only The Two Circled Giraffes Leave Offspring

10:0

Now The Only Allele Present Is The Tall (T) Allele