Mechanisms of Evolution

After a long time in isolation, Island fruit flies and mainland fruit flies meet. They do not produce viable eggs due to genetic differences. The flies have resulted in two seperate lineages due to:

• Gene Pool

• Genetic Drift

• Gene Frequency

• Speciation

According to the theory of natural selection, why are some individuals more likely than others to survive and reproduce?

• Some individuals pass on to their offspring new characteristics they have acquired during their lifetimes.

• Some individuals are better adapted to exist in their environment than others are.

• Some individuals do not pass on to their offspring new characteristics they have acquired during their lifetimes.

• Some individuals tend to produce fewer offspring than others in the same environment.

In natural selection, the selective agent is the

• humans
• mutations
• breeders
• environment

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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

Which of the following is a term for a group of similar organisms that can reproduce fertile offspring?

• individual
• population
• species
• fossil

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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

A(n)________ is a measure of how common a certain allele is in a population.

• Allele Frequency

• Gene Pool

• Genotypical Number

• Genetic Drift

Which word means the formation of new species?

• speciation

• specialization

• founder effect

• sexual selection

When members of two populations cannot successfully reproduce.

• reproductive isolation

• lonely isolation

• convergent isolation

• genetic drift

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Wolves from the Arizona mesa were transferred to the Colorado Rockies after a forest fire destroyed their habitat. They quickly became part of the local pack and had offspring.

• Mutation
• Natural Selection
• Genetic Drift
• Gene Flow

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