Evolution Mechanisms

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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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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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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Bats are common in Texas, especially in rocky regions. Bats with longer hang claws have demonstrated higher fitness because of their ability to cling to rock while resting. This adaptation is becoming more frequent in the population. What mechanism of evolution is this?

• Natural Selection

• Non-random mating

• Gene Flow

• Genetic Drift

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Mutations are important because they bring about

• death of the organism in which they develop

• genetic variation needed for a population to evolve

• benefits for the individual, not for the population

• Hardey-Weinberg equilibrium within a population

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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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