Mechanisms of Genetic Change

What is the definition of Genetic Drift?

• This mechanism of evolution introduces new genes into the gene pool which results in increased genetic variability and new traits present in the population.

• This mechanism of evolution results usually after a drastic decrease in the population size (like being stranded on an island) leaving only those genes present in the remaining individuals in the gene pool. This change in the allele frequency, ultimately changes the phenotypes most common in the population.

• The mechanism of evolution that results from the migration of organisms into a new population or out of a population, changing the gene pool of each population.

• This mechanism of evolution results when those organisms most fit for an environment survive and reproduce better than others in the population.

What's the definition of non-random mating?

• This mechanism of evolution results by the likelihood that organisms select their mate based on certain criteria such as color, size, song, or other mating behaviors

• This mechanism of evolution results when those organisms most fit for an environment survive and reproduce better than others in the population.

• The mechanism of evolution that results from the migration of organisms into a new population or out of a population, changing the gene pool of each population.

• This mechanism of evolution introduces new genes into the gene pool which results in increased genetic variability and new traits present in the population.

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Find the definition for genetic mutations and their impact on evolution.

• This mechanism of evolution results when those organisms most fit for an environment survive and reproduce better than others in the population

• This mechanism of evolution results by the likelihood that organisms select their mate based on certain criteria such as color, size, song, or other mating behaviors

• This mechanism of evolution introduces new genes into the gene pool which results in increased genetic variability and new traits present in the population.

• The mechanism of evolution that results from the migration of organisms into a new population or out of a population, changing the gene pool of each population.

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What's the definition of gene flow?

• This mechanism of evolution introduces new genes into the gene pool which results in increased genetic variability and new traits present in the population.

• The mechanism of evolution that results from the migration of organisms into a new population or out of a population, changing the gene pool of each population.

• This mechanism of evolution results by the likelihood that organisms select their mate based on certain criteria such as color, size, song, or other mating behaviors

• This mechanism of evolution results when those organisms most fit for an environment survive and reproduce better than others in the population.

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What is the definition for natural selection?

• This mechanism of evolution results by the likelihood that organisms select their mate based on certain criteria such as color, size, song, or other mating behaviors

• The mechanism of evolution that results from the migration of organisms into a new population or out of a population, changing the gene pool of each population.

• This mechanism of evolution introduces new genes into the gene pool which results in increased genetic variability and new traits present in the population.

• This mechanism of evolution results when those organisms most fit for an environment survive and reproduce better than others in the population.

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Determine the mechanisms of evolution that would result in this situation: "A population of green frogs live in the rainforest. A random change in the DNA introduces a new trait, green spotted frogs, into the population."

• Mutations

• Gene flow

• Genetic drift

• Natural selection

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Determine the mechanism of evolution that would result in this situation: "In a certain species of birds, males have brightly colored feathers. Females pick a mate based on which male has the prettiest feathers and has the best courtship dance."

• Natural selection

• Genetic drift

• Non-random mating

• Gene flow

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Determine the mechanism of evolution that would result in this situation: "In the savannah, lions chase and eat gazelle. The slower gazelle get eaten first so overtime the gazelle population has become faster."

• Gene flow

• Genetic drift

• Mutation

• Natural selection

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Determine the mechanism of evolution that would result in this situation: "A population of whitetail deer migrate northeast into an area where there is more food and water and become part of the brown tail deer population in that area. Overtime, the whitetail deer begin to mate with the brown tail deer."

• Natural selection

• Gene flow

• Non-random mating

• Genetic drift

Determine the mechanism of evolution that would result in this situation: "In a local field, there is a population of field mice that contains 75% brown mice and 25% white mice. A fire in the field kills all but 20 of the field mice that live there. The remaining population is 40% brown and 60% white. Overtime, these 20 field mice reproduce and re-build the population."

• Mutation

• Natural selection

• Genetic drift

• Gene flow

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