Imagine that you go the the mountaintop this year, sample these beetles, and determine that 80% of the genes in the population are for green coloration and 20% of them are for brown coloration. You go back the next year, repeat the procedure, and find a new ratio: 60% green genes to 40% brown genes You have detected a micro evolutionary pattern: a change in gene frequency. A change in gene frequency over time means that the population has evolved. The big question is, how did it happen?
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