Mechanisms of Evolution Lesson

The founder effect occurs when a new population is established by a very small number of individuals from a larger population.

• False

• True

What occurs when members of one population migrate and interbreed with another population.

• Mutation

• Gene Flow

• Bottle Neck Effect

• Even distribution of traits

Non-Random Mating occurs when:

• Organisms may prefer to mate with others of the same genotype or of different genotypes

• Organisms and gametes enter a population with new alleles

• Mutations occur more frequently

• An organism's biological fitness decreases

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What do scientists call a mutation that decreases an organism's biological fitness?

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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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

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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Which of the following does not produce evolutionary change?

• genetic drift

• mutation

• gene flow

• none of the choices

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Genetic drift is most influential in ____________.

• small population

• moving environment

• large population

• stable environment

Which of the following is correct about mutation?

• It respond to environment pressure by producing new forms of genes.

• It creates new allele that may be beneficial or harmful.

• It is not random.

• All of the choices

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