Diane Dodd raised different fruit fly populations on different food sources.She found that after about 40 generations,the evolution of reproductive isolation was under way.The mechanism of evolution responsible for this was

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The evolution of reproductive isolation suggests that natural selection is at play. As the fruit fly populations adapted to different diets, there was likely selection for individuals that could more successfully reproduce on their specific food source. Over time, this could lead to the accumulation of genetic differences that prevent interbreeding between the different populations.

Diane Dodd Raised Different Fruit Fly Populations on Different Food