A Group That Is Experimenting with Selection in an Insect

question 15

Multiple Choice

A group that is experimenting with selection in an insect species due to exposure to a newly developed insecticide,cpd AW143,has found that,after 10 generations of exposure,the population is now bimodal in its response to the drug.Close to 30% of the population are completely normal while 70% live only about 1/6 of the normal lifetime.This is an example of

• A)threshold effect.
• B)stabilizing selection.
• C)additive genes.
• D)directional selection.
• E)disruptive selection.

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