CB ch 18 microevolution

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

• genetic drift

• gene flow

Phenotypic forms at both ends of the range are favored and the intermediate forms are selected against.

• directional selection

• stabilizing selection

• disruptive selection

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Cockroaches becoming increasingly resistant to pesticides is an example of

• disruptive selection

• genetic drift

• directional selection

• stabilizing selection

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In the Hardy Weinberg equations the recessive phenotype frequency is represented by

• p

• q

• 2pq

• q²

All of the following can allow a population to evolve EXCEPT

• small population size

• natural selection

• mutation

• no sexual selection

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Natural selection acts on alleles.

• True

• False

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T5. What does the image represent?

• Founder effect
• Bottleneck effect
• Mutation
• Natural Selection

What type of selection is depicted in the picture where one phenotype is favored?

• stabilizing

• directional

• disruptive

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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

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Which Hardy-Weinberg factor represents the frequency of heterozygous individuals in a population?

• p2
• 2pq
• q2
• p2 + 2pq

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