Populations in Evolution

Which answer best shows an animal's adaptation to the tropical rain forest?

• camouflage in a tree frog

• the long neck of a giraffe

• an elephant's long trunk

• migration of birds in winter

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NGSS.MS-LS4-4

Gene pool

• Total number of alleles of the genes that are present in a population of a particular species of organism at a given time

• The condition of a population in which allele and genotype frequencies remain constant from one generation to the next

• The number of phenotypes present in a population of a species at a given time

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NGSS.MS-LS4-4

This mechanism of evolution occurs when individuals migrate between populations.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection

Genetic drift is change in the allele frequency of a population due to...

• random chance
• natural selection
• non-random mating (sexual selection)
• artificial selection

According to Genetic drift (bottleneck or founder) tends to ___________ genetic variation (diversity).

• Increase

• Decrease

• Stabilize

• Exaggerate

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NGSS.HS-LS4-5

Which of the three graphs shows directional selection?

• A
• B
• C

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NGSS.HS-LS4-4

The measure of how common an allele is in a population is known as ___________.

• Allele Combination
• Allele Frequency
• Gene Pool
• Genotypic Frequency

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NGSS.HS-LS4-3

NGSS.HS-LS4-4

Yellow toucan birds seek out one another to make babies together and tend to avoid the green toucan birds.

• Genetic Drift
• Sexual Selection
• Gene flow
• Mutation

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NGSS.HS-LS2-8

NGSS.HS-LS4-4

Disruptive selection will favor...

• extreme traits.
• average traits.
• one phenotype over another.

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NGSS.HS-LS4-3

NGSS.HS-LS4-4

_{What type of selection?}

• Directional 
• Stabilizing
• Disruptive

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NGSS.HS-LS4-3

NGSS.HS-LS4-4