Mechanisms of Evolution

Insects become resistant to pesticides very quickly, sometime in one generation. If an insect is resistant to the chemical, most of the offspring will also be resistant. Considering that insect generations can be a matter of weeks, insects in an area can become immune to a chemical within months.

• Mutation

• Natural Selection

• Genetic Drift

• Gene Flow

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A chemical spill causes the offspring of ladybugs to have blue dots instead of black dots.

• Natural Selection

• Genetic Drift

• Mutation

• Gene Flow

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Yellow toucan birds seek out one another to make babies together and tend to avoid the green toucan birds.

• Genetic Drift
• Non-random mating
• Gene flow
• Mutation

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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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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.

• Adaptation
• Non-random mating
• Gene Flow
• Mutation

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What does the image represent?

• Founder effect
• Bottleneck effect
• Natural Selection
• Mutations

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A physical trait favored by an environmental change can be called an (a)  

• adaptation
• extinction
• possibility
• mutation

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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.

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New individuals immigrate into a population

• natural selection

• genetic drift

• gene flow

• mutation

• nonrandom mating

Answer explanation

Gene flow deals with movement. One individual going from one population to another. This individual bring its DNA (genes).

Organisms better adapted, or better suited are more likely to survive and reproduce in their environment

• natural selection

• genetic drift

• gene flow

• mutation

• nonrandom mating

Answer explanation

ADAPTATION!!!!

SURVIVAL and REPRODUCTION!!!!!

That is natural selection

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