SCIENTIFIC INQUIRY • DRAW IT Mosquitoes resistant to thepesticide DDT first appeared in India in 1959, but now are foundthroughout the world. (a) Graph the data in the table below.(b) Examine the graph, then hypothesize why the percentageof mosquitoes resistant to DDT rose rapidly. (c) Suggest anexplanation for the global spread of DDT resistance.Month0812Mosquitoes Resistant* to DDT4%45%77%*Mosquitoes were considered resistant if they were not killed within 1 hour of receivinga dose of 4% DDT.Data from C. F. Curtis et al., Selection for and against insecticide resistance andpossible methods of inhibiting the evolution of resistance in mosquitoes, EcologicalEntomology 3:273–287 (1978).

Dichloro-diphenyl-trichloroethane (DDT) is the first synthetic insecticide, which was used to kill…

Answered: SCIENTIFIC INQUIRY • DRAW IT Mosquitoes…

Human Anatomy & Physiology (11th Edition)

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Author:Elaine N. Marieb, Katja N. Hoehn

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Chapter1: The Human Body: An Orientation

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SCIENTIFIC INQUIRY • DRAW IT Mosquitoes resistant to the
pesticide DDT first appeared in India in 1959, but now are found
throughout the world. (a) Graph the data in the table below.
(b) Examine the graph, then hypothesize why the percentage
of mosquitoes resistant to DDT rose rapidly. (c) Suggest an
explanation for the global spread of DDT resistance.

Month	0	8	12
Mosquitoes Resistant* to DDT	4%	45%	77%

*Mosquitoes were considered resistant if they were not killed within 1 hour of receiving
a dose of 4% DDT.
Data from C. F. Curtis et al., Selection for and against insecticide resistance and
possible methods of inhibiting the evolution of resistance in mosquitoes, Ecological
Entomology 3:273–287 (1978).

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