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It works in this case just as it does in resistance to antibiotics. When the environment is changed, those living in it will be either affected or not. Some bacteria or mosquitoes will not be affected and some will. The affected ones will die and the others will not. Those that don't die will have genes that allow this to happen for them. They will pass those genes on to their offspring. Those offspring will also be resistance to what every pesticide or antibiotic being used to kill them. You are seeing actual natural selection and evolution at work.
Penicillin was used in WW2 in 1943. Today, there are bacteria that are resistant to every antibiotic that we have. Some are resistant to 23.
Unless the insecticide kills every mosquito, the ones that survive will grow in numbers and we will have to find something else. The most we usually can hope for is just to be able to control the numbers.
Wiki User
∙ 6y ago
Wiki User
∙ 15y agoaddapted to the resistance just as fish with gills
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Explain why when DDT is used the numbers of mosquitoes first go down but then start increasing again?
When DDT is used, most of the mosquitoes are killed initially. However some develop a resistance and begin to repopulate.
What kills mosquitoes?
insectisides,pesticides,chemicals like ddt etc. kill mosquitoes
Can DDT cause malaria?
No, DDT is used against mosquitoes which are vectors of malaria.
Why is ddt still used today even though it is harmful?
DDT is very efficient against mosquitoes.
Why do predatory birds die when DDT is sprayed onto land or water?
Your premise is incorrect; DDT does not kill birds. DDT kills mosquitoes.
Why is the spread of malaria increasing?
There has been increasing resistance of mosquitoes to DDT. The P. falciparum became resistant to chloroquine. These two problems together was responsible for increasing the cases of malaria.
Why human cells not getting resistance towards tobacco?
the ants getting resistance to DDT while the humans not getting resistance to tobacco? the ants getting resistance to DDT while the humans not getting resistance to tobacco- why
Was ddt used to kill bad bugs 50 years ago?
Yes, DDT is very efficient against mosquitoes and other insects.
Why is DDT banned?
DDT (dichlorodiphenyltrichloroethane) is an insecticide. Its most known usage is killing mosquitoes that carry malaria. However, there are resistant mosquitoes, and DDT has some severe health and environmental risks, and thus its usage is highly restricted.
Why do some countries still use DDT?
Some countries still use DDT (dichlorodiphenyltrichloroethane) for mosquito control to prevent the spread of diseases such as malaria. It is effective against mosquitos and cost-effective compared to alternative methods. However, DDT is also a persistent organic pollutant that can have harmful environmental and health impacts.
Is DDT illegal?
The use of DDT was banned in the USA in 1973 although it is still in use in some other parts of the world
Why was ddt used in borneo?
To kill mosquitoes to stop the deadly disease called malaria from spreading
