Flashcards in Chapter 6 Deck (8):
Why is it essential that traits be inherited for evolution to occur?
The insecticide DDT has been widely used to control the mosquitoes that carry malaria. How would you explain the fact that many mosquito populations are now resistant to DDT?
What are the sources of genetic variation, and why is genetic variation important to evolution?
Compare and contrast evolution by artificial selection with evolution by natural selection.
How should stabilizing selection and disruptive selection affect the magnitude of phenotypic variation from one generation to the next?
Suppose that rapid environmental change- for example, change caused by human activities- exerts very strong selection on a population. Contrast the changes that one might observe in allele frequencies and in population size.
Individual cactus wrens orient their nests in one direction during the cool spring months, but in a different direction during the hot summer months. What does this observation suggest about the kinds of traits that selection has acted on during the evolution of behavior?