Mechanisms of Evolution II

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

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

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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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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

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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

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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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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

Which of the following cannot introduce new alleles into a population's gene pool?

• Mutation
• Natural selection
• Gene Flow
• All of the above introduce new alleles into the population

Which of the following is true of genetic drift?

• It can decrease genetic diversity in a population
• It is necessary in order for a population to be in equilibrium
• It can increase genetic diversity in a population 
• It plays a much larger role in determining the genetic makeup of populations than natural selection