1
Question
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
(c) Briefly mention why the changes shown in the two figures appeared.
(c) Briefly mention why the changes shown in the two figures appeared.
Open in App
Solution
Originally, peppered moths lived where light-colored lichens covered the trees.
- For camouflage from predators against that clean background, they had generally light coloration.
- During the industrial revolution in England, sulphur dioxide pollution in the atmosphere reduced the lichen cover, while soot blackened the bark of urban trees, making the light-colored moths more vulnerable to predation.
- This provided a selective advantage to the gene responsible for melanism, and the darker-colored moths increased in frequency.
- For camouflage from predators against that clean background, they had generally light coloration.
- During the industrial revolution in England, sulphur dioxide pollution in the atmosphere reduced the lichen cover, while soot blackened the bark of urban trees, making the light-colored moths more vulnerable to predation.
- This provided a selective advantage to the gene responsible for melanism, and the darker-colored moths increased in frequency.
Suggest Corrections
1
Similar questions