Genetic Drift- Urte Z.

Genetic Drift- Urte Z.
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  • Genetic Drift
  • 100 years ago there lived a small community of snakes. 50% of them were blue, and 50% of them were yellow.
  • One day, all the blue snakes happened to be standing in the same place.
  • A dead tree fell right on top of the blue snakes, killing four of the five.
  • Now, the blue snakes represented only 1/6 of the population, whereas before, they represented 1/2 of the population.
  • When the snakes repopulated, only yellow snakes were born, and the trait giving the snakes a blue color was not passed on.
  • After the last blue snake died of old age, there were no more blue snakes in the population.
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