Lec70%20Darwin%20and%20evolution - 4/1/09 1 Descent with...

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Unformatted text preview: 4/1/09 1 Descent with Modifcation Prelim mean: 92.3% S.D. = 17.8% April Fool!!!!! When insect populations are sprayed with insecticides or long periods, resistant individual arise. How does this happen? A. the insecticide creates specifc mutations that make the insects resistant B. the insecticide creates mutations in general, which make some individuals, by chance, resistant C. the insecticide selects or individuals that already have mutation(s) that make them resistant D. the insecticide kills most o the insects, but increases the reproductive rate o those that are not killed E. the insecticide improves the immune response o those individuals that are lucky enough to survive a frst exposure to the insecticide When insect populations are sprayed with insecticides or long periods, resistant individual arise. How does this happen? A. the insecticide creates specifc mutations that make the insects resistant B. the insecticide creates mutations in general, which make some individuals, by chance, resistant C. the insecticide selects or individuals that already have mutation(s) that make them resistant D. the insecticide kills most o the insects, but increases the reproductive rate o those that are not killed E. the insecticide improves the immune response o those individuals that are lucky enough to survive a frst exposure to the insecticide * Darwins major ideas members o a population vary at least some o the variation is heritable more ospring are produced than can survive and reproduce the best adapted individuals have more chance o reproducing As a result, populations will adapt to new environments, gradually giving rise to new species 4/1/09 2 The evidence for evolution: Direct observation HIV Resistance Soapberry bugs have evolved since the introduction of new hosts in recent years. In south-central regions larger fruits are now available (upper). In Florida the introduced fruits are smaller (lower). Beak length has changed proportionately....
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Lec70%20Darwin%20and%20evolution - 4/1/09 1 Descent with...

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