Natural Selection and Microevolution

A random change in allele frequencies over generations brought about by chance.

• genetic drift

• gene flow

Cockroaches becoming increasingly resistant to pesticides is an example of

• disruptive selection

• genetic drift

• directional selection

• stabilizing selection

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Mutations are random while natural selection is NOT

• True

• False

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Emigration is an example of

• genetic drift

• gene flow

When allele frequencies change due to individuals leaving a population

• genetic drift

• gene flow

Founder effect and bottlenecks are two extreme cases

• genetic drift

• gene flow

Blue Jays introduce new alleles to oak forests as they make hundreds of round trips carrying acorns from oak trees a mile away to new soil in their home territory for winter.

• genetic drift

• gene flow.

Genetic fitness means that an organism's ability to do what is high?

• lift weights really well

• reproduce effectively

• attract other members of their species

• survive environmental disasters

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Microevolution happens in

• species

• individuals

• populations

• households

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Natural selection requires ______________ to happen in a population.

• hundreds of years

• variation

• low genetic fitness

• high genetic fitness

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