Section 6: Graded Questions Darwinian Snails NOTESQUES ser- Q6.7. DDT is an inse

Question

Section 6: Graded Questions Darwinian Snails NOTESQUES ser- Q6.7. DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Which of the following conditions would biologists say was required for the evolution of DDT resistance in a population? mer 2 A few mosquitoes in the population were resistant to DDT before it was ever used Mosquitoes in the population learned to adapt to the high levels of DDT in the environment. The mosquito population needed to evolve DDT resistance in order to avoid extinction Exposure to DDT caused specific, nonrandom mutations for DDT resistance within the population Use the following passage to answer the next two questions. Ducks are aquatic birds. Their feet are webbed and this trait makes them fast swimmers Biologists believe that ducks evolve d from land birds that did not have webbed feet. The amount of webbing on a duck's feet is a heritable trait Q6.8. While webbed feet were evolving in ancestral ducks, with each generation: Most ducks had about the same amount of webbing on their feet as Most ducks had mone webbng on then let wan thr parents Most ducks had less webbir The amount of webbing on ducks) eir parents. t than their parents r parents The amount of webong oe caucs eet hac a relationship with the amount their parents no relationship with the amount their parents had

Explanation / Answer

6.7 Correct answer:- (d) Exposure to DDT caused specific, nonrandom mutations for DDT resistance in the population.
Explanation- scientists found a single mutation in the GSTe2 gene, which makes mosquito break down DDT so it’s no longer toxic.

6.8 Correct answer:- (a) with each generation, most ducks had about the same amount of webbing on their feet as their parents.

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