Mechanisms for Evolution

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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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

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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A few deer wander out of their native woods into a completely new park where no deer had ever been before. They go on to create an entirely new population.

• Genetic Drift

• Natural Selection

• Non-random mating

• Mutation

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Five hundred years after the deer had established a flourishing population in the park, a few of them venture back to their original woods and have babies with the deer there.

• Genetic Drift

• Mutations

• Non-random mating

• Gene flow

What does the image represent?

• Gene flow

• Gene drift

• Mutation

• Adaptation

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During gestation (pregnancy), a developing male pig had a change in his genetic code. The result was that he was able to walk and do karate.

• Genetic Drift

• Non-random mating

• Mutation

• Natural Selection

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What does the image represent?

• Founder effect

• Bottleneck effect

• Natural Selection

• Mutations

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Which organisms are most likely to survive?

• the best adapted

• the fastest

• the strongest

• the most domesticated (tamed)

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