Ch. 17 Evolution of Populations

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

• Gene pool

• Relative Frequency

• Genetic Drift

• Allele pool

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

• Allele Combination

• Allele Frequency

• Gene Pool

• Genotypic Frequency

Many members of one species in an area

• ecosystem

• community

• biodiversity

• population

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

In the past, individuals in a population of seed eating birds had a wide variety of beak sizes. After many generations, the birds either have small beaks or large beaks, but medium size beaks are absent. If the number of birds with each beak size was graphed which example would it look like?

• A

• B

• C

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

• gene flow

• genetic drift

• natural selection

• all answers are correct

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

The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called

• the Hardy-Weinberg principle

• the founder effect

• directional selection

• the bottleneck effect