Genetic drift and Gene flow
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A boat shows up on a island
The boat carried two dogs. One dog was white with long fur, while the other is has short brown fur.
Over time the dogs start populating the area.
After generations of mating, the alleles of the white dog and dark brown dog mutate, creating a gold dog with medium fur.
After some time the gold dog population began to increase, which caused the other dog population to decrease. The gold dogs had short and light fur to withstand the heat
A wave came and wiped out 75% of the population of dogs!
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