Ch. 13.1 & 13.2 Evolution of Populations

Evolution can be described as a change in ________ frequencies over time.

• natural selection

• species

• allele

• population

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Which of the following is an example of the bottleneck effect?

• Bald Eagles are hunted until near extinction, survivors reproduce and the population recovers.

• Small group of iguanas floats to an island, starts a new population.

• Red fox pups are more likely to survive in a snowy environment if they are born white.

• Farmer chooses seeds from largest apples to plant next year.  This results in larger apples from year to year.

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Which of the following is NOT an example of natural selection? 

• People selectively breeding hamsters.

• Insect populations developing resistance to certain pesticides.

• Bacteria becoming resistant to antibiotics.

• Male birds of certain species developing colorful feathers to attract female mates.

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Which of the following is an example of the founder effect?

• Bald Eagles are hunted until near extinction, survivors reproduce and the population recovers.

• Small group of iguanas floats to an island, starts a new population.

• Red fox pups are more likely to survive in a snowy environment if they are born with white fur.

• Farmer chooses seeds from largest apples to plant next year.  This results in larger apples from year to year.

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Bats are common in Texas, especially in rocky regions. Bats with longer claws have demonstrated higher fitness because of their ability to cling to rock while resting. This adaptation is becoming more frequent in the population. What mechanism of evolution is this?

• Natural Selection

• Bottleneck Effect

• Genetic Equilibrium

• Genetic Drift

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Mutations are important because they bring about

• death of the organism in which they develop

• genetic variation needed for a population to evolve

• benefits for the individual, not for the population

• changes in genotype, but not phenotype

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All of the possible gene combinations in a population.

• allele

• gene pool

• polygenic trait

• genetic equilibrium

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The allele frequencies of the mouse population in the picture are changing over time. Which is true?

• The population is evolving.

• The population is not evolving.

• The population will go extinct.

• The population's genetic variation is increasing.

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Small populations are more prone to genetic drift than large populations.

• True

• False

the selection pressure favors the extreme phenotypes, dividing the population into 2 distinct groups

• directional selection

• stabilizing selection

• geographic selection

• disruptive selection

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