What will happen to the number of light-colored peppered moths as the trees began to darken? What will happen to the number of dark colored peppered moths as the trees began to darken?

Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter19: The Evolution Of Populations
Section: Chapter Questions
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Background Information: Before the industrial revolution, the trees in the forest around Manchester, England were a light grey/green due to the color of lichens (fungus) on their trunks. Peppered moths, or Biston betularia, which lived in the area were found in two varieties: 1) Light with dark spots (most common) and 2) Dark with light spots (less common). Because there were not enough resources to support the entire population, the two varieties of this species had to compete for survival. Their coloring, when against a similar background, served as camouflage against predators such as birds and lizards, thus increasing chances of survival. As the Industrial Revolution progressed, the trees became covered with sulfur dioxide, which killed the light-colored lichen and thus turning the tree trunks dark.

 

Problem Questions: Choose only 1 question below to answer in an “If…then” hypothesis.

  • What will happen to the number of light-colored peppered moths as the trees began to darken?
  • What will happen to the number of dark colored peppered moths as the trees began to darken?

 

 

Hypothesis and Null Hypothesis:

 

 

 

 

Background Questions:

 

  • Define the following terms.
  1. Adaptation:
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