All Evolution Unit Review

Some organisms have genes that improve their ability to survive and reproduce. If the gene also help their offspring survive and reproduce, then which of the following will most likely increase?

• The number of genes in a species
• The frequency of genes in a population
• The frequency of genes in one individual 

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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 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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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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This mechanism of evolution occurs when populations migrate.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection

Random change in allele frequency

• evo-devo
• genetic drift
• allele frequency
• gene pool

What type of selection is depicted in the picture? 

• stabilizing 
• directional 
• disruptive 
• the answer is not here

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_{What type of selection?}

• Directional 
• Stabilizing
• Disruptive

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What kind of isolation occurs when two populations of birds have different courtship dances?

• geographic
• sexual
• temporal
• behavioral

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Which of the three graphs shows disruptive selection?

• A
• B
• C

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