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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? 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.
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Despite the fact that DDT had never been in use in their region before, some mosquitoes are fortunate enough to have the ability to naturally survive exposure to the chemical and pass it on to their progeny.

Prior to its use, were mosquitoes immune to DDT?

Depending as to whether DDT has indeed been sprayed before, what occurs next.Since its discovery in India in 1959, DDT-resistant mosquitoes have multiplied so quickly that when a regional spraying program is implemented now, the majority of mosquitoes develop resistance in a short period of time rather than years.

What impacts mosquitoes does DDT have?

However, DDT served as a "chemical screen," preventing 59% of mosquitoes from entering the hut at all.DDT decreased the number in mosquitoes that can spread disease by 73% when combined with its mild irritating and poisonous qualities, the researchers discovered.

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