Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
Related questions
Question
Explain why the frequency of alleles for insecticide
resistance in mosquito populations decreased when the
insecticide was no longer sprayed.
Expert Solution
Step 1
Genetic studies demonstrate the resistance to insecticides in several insects can result from mutations in various genes. DDT (dichlorodiphenyltrichloroethane) is a nerve toxin insects as it binds to the sodium channel protein and disrupts its function and nerve transmission. In some cases the dominant mutations in the alleles or in gene regulatory sequences lead to over expression of detoxifying enzyme. Both the dominant and recessive mutations contributing to the DDT resistance are of neither concern for controlling the insect pests.
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