Mechanisms of Evolution

At what level does evolution occur?

• Cells

• Ecosystem

• Individuals

• Populations

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NGSS.MS-LS4-4

Which of the following statements about gene flow is TRUE?

• Gene flow is a result of individuals that breed in an old location

• Gene flow is a result of migrating individuals that breed in a new location

• Gene flow is not a result of migrating individuals that breed in a new location

• None of the statements are true

Which of the following criteria about Hardy-Weinberg Equilibrium does not

belong to the group?

• Random mating

• No mutation occurred

• A very large population size

• Gene pool is affected by natural selection

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NGSS.HS-LS4-4

Which of the following occurs when allele and genotype frequencies do not

change from generation to generation?

• Gene flow

• Genetic drift

• Natural selection

• Handy-Weinberg Equilibrium

How do evolution directly affected by the gene flow?

• It doesn’t contribute to evolution

• It introduces new alleles into a population.

• It reduces the number of members in a population.

• It changes the environment in which a population resides.

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NGSS.HS-LS4-2

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In order for the genetic drift to occur, what is the necessary parameter?

• The population must be large.

• The population must be small.

• The population must be under environmental stress.

• The population must be sterile.

What will happen to the organisms during natural selection?

• Organisms tend to remain the same

• Organisms tend to adapt the changes

• Organisms tend to ignore the changes

• None of the statement is correct

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What should fittest individual must do in order for the evolution to occur?

• Avoid predators more successfully

• Be better at obtaining food

• Leave more offspring

• Must be sterile

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In what situation, artificial selection takes place?

• Susceptibility testing of microorganisms against antibiotics

• The different finches found by Darwin in the Galapagos

• Cultivations of new varieties of rice plants

• Elongated neck of giraffe

A group of scientists is studying a certain gene in a population of fish. This gene has two alleles: a dominant allele (Y), and a recessive allele (y). The scientists collected allele frequency data for the gene twice over a 12-year period. The results are presented in the following table.

population was not in Hardy-Weinberg equilibrium during the time period studied.

Which of the following is the most likely reason that the population deviated from Hardy-Weinberg expectations during the study period?

• Female fish in the population preferred mates with a certain color pattern.

• There was little or no migration of fish into or out of the population.

• The fish’s environment was stable, so no natural selection occurred in the population.

• The fish population was consistently large throughout the study period.

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