Natural Selection and Genetic Drift- Ratliff

During natural selection, the organisms with the best adaptations..

• survive better in their environment
• have higher fitness
• pass down their traits more often
• All of these are correct

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Do populations "decide" to evolve and change?

• Yes, they know they need to change to survive

• No, they change because of natural selection

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Why are advantageous traits more likely to be passed onto offspring?

• Because the organisms that have them are more likely to survive and reproduce.

• Because they come from dominant alleles.

• Because they come from recessive alleles.

• Because the trait is an acquired phenotype.

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a rabbit that can easily out-compete other rabbits for food and that can produce many offspring has a high

• life expectancy

• mutation rate

• fitness

• adaptability

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The process by which populations slowly change over time is called__________

• selective breeding
• adaptation
• sepeciation
• evolution

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Genetic drift is more likely to happen in...

• aquatic populations

• small populations

• terrestrial populations

• older populations

Which of the following is an example of the bottleneck effect?

• Cheetah populations reach their lowest levels with reduced diversity and as they rebound are so genetically similar they appear to be inbred.

• Affected individuals with blue skin can trace their ancestry back to one of the first settlers in the region.

• The environment of a fox population changes and over time foxes who are white survive and pass on their genes to their offspring.

• Humans choose two dogs they like the characteristics of and breed them together.

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Genetic drift is change in the allele frequency of a population due to...

• random chance

• natural selection

• non-random mating (sexual selection)

• artificial selection

This mechanism of evolution occurs when populations migrate (immigrate, emmigrate).

• Extinction

• Gene flow

• Genetic drift

• Natural Selection

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What type of genetic drift is most common after a natural disaster which results in a drastic reduction in population size?

• Bottleneck Effect

• Founders Effect

• Gene Flow

• Sexual Selection

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