Fruit Fly Mutations: Evidence for Evolution? – Apologetics Press 

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Human pregnancies, on average, last 38-40 weeks—approximately nine months. This makes potential genetic change in the human race relatively slow. Not so with Drosophila melanogaster: the fruit fly. If you were to make a short list of creatures that could serve as examples to prove neo-Darwinian evolution to be a legitimate theory, the common fruit fly would probably be on the list.1 Female flies can lay about 500 eggs in their lifetime, and each fly can grow from egg to adult in about a week2—translating to about 50 generations per year.

After only a century of testing, scientists have been able to observe over 5,000 generations of fly reproduction. Thus, the fruit fly has been considered an ideal candidate for studying evolution in action. If mutations are the mechanism that would allow for molecules-to-man evolution as evolutionists suggest, then watching mutations, and even causing mutations in fruit flies to speed things up, could provide strong evidence to support that contention.

That is precisely how fruit fly evolutionary studies have been viewed for over a century.

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