Evolution of populations

What do you call all of the genes in a population?

• Gene pool
• Relative Frequency
• Genetic Drift
• Allele pool

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NGSS.HS-LS4-2

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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Many members of one species in an area

• ecosystem
• community
• biodiversity
• population

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Which of the three graphs shows directional selection?

• A
• B
• C

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A population of pigs with small, medium, and long snouts lives on an island together with burrowing termites. Pigs that have the longest snouts tend to survive better. Over time, most of the pig population is made up of individuals that have very long snouts. This is an example of which type of selection?

• directional selection
• disruptive selection
• stabilizing selection
• sexual selection

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If finches with large beaks and finches with small beaks increase in a population while finches with average sized beaks decreases, which pattern of natural selection has occurred?

• Directional selection
• Disruptive selection 
• Stabilizing selection
• Sexual Selection

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If finches with average sized beaks increase in a population while finches with large and small sized beaks decrease, which pattern of natural selection has occurred?

• Directional selection
• Disruptive selection 
• Stabilizing selection
• Sexual Selection

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NGSS.HS-LS4-4

Which is a mechanism that causes a change in allele frequency?

• gene flow
• genetic drift
• natural selection
• all answers are correct

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NGSS.HS-LS4-4

This mechanism of evolution occurs when populations migrate.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection

A chance occurrence that negatively affects a population because the population is small.

• genetic drift
• mutation
• speciation
• migration

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