constant due to the metabolic costs of DDT utilization b) Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. c) DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. d) Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT.
constant due to the metabolic costs of DDT utilization b) Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. c) DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. d) Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT.
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter12: Mendel, Genes, And Inheritance
Section: Chapter Questions
Problem 3ITD: Half of the worlds population eats rice at least twice a day. Much of this rice is grown in flooded...
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The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes?
a) The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization
b) Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs.
c) DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations.
d) Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT.
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