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Chapter 12: Mechanisms of Evolution: Battling Resistance
toby.dakin-beeby.390@my.csun.edu
Page(s) 226-229
12.1. Clarify why evolution occurs only in populations, not in individuals.
Consider the following scenarios:
In mosquitoes, whether their bites can be felt by humans is a genetic trait of the mosquito. Over time, humans who feel mosquitoes biting swat and kill so many mosquitoes that most of the remaining mosquitoes possess bites that cannot be felt.
Orchid collectors search the rainforest for rare orchids. Some orchids have alleles that allow their roots to adhere to trees so strongly that they cannot be removed without killing the plant. The collectors leave these individuals alone and collect the others. After a while, most orchids remaining the forest display the strong adherence trait.
A person is given a medication to alleviate back pain. After a few months, the person must increase the dosage because the initial dose no longer has the same effect.
Your neighbor treats his yard with an herbicide to control weeds. None of the weeds are killed by the herbicide, but the weeds seem to show resistance to the herbicide after the treatment.
Which scenario above is an example of evolution?
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