Mechanisms of Evolution

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

• False

• True

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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?

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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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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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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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