Microevolution

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.

• gene pool 

• founder effect

• bottleneck

• mutation

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Ten years ago, in a small population of ducks, two sizes of eyes were observed, large and small. Three ducks have large eyes and 7 have small.  2 of the large-eyed ducks are randomly hit by cars and killed. Today, no large-eyed ducks are present in the population.

• gene flow

• bottleneck

• mutation

• founders

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The more genetic variation a population has,

the more likely it is for some individuals to

• evolve

• migrate

• survive

• mutate

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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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A population of Madagascar hissing cockroaches lives in a woodpile. The cockroaches are eaten by lizards. Because the lizards have small heads, the lizards are unable to eat the very largest adult cockroaches, and instead prey upon small and medium sized adults. Over time, only the large headed lizards survive.

• Stabilizing

• Directional

• Disruptive

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Female birds that lay close to the optimum number of eggs have the most surviving offspring. Those that lay fewer or more eggs have lower relative fitness.

• Stabilizing

• Directional

• Disruptive

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Black rabbits (BB) and white rabbits (bb) are both able to survive because they can camouflage into the white and black rocks in their environment. However, the intermediate gray rabbits (Bb) do not survive. This results in only white and black rabbits.

• Stabilizing

• Directional

• Disruptive

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Do organisms "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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Which organisms are most likely to survive?

• the best adapted

• the fastest

• the strongest

• the most domesticated (tamed)

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The idea that evolution seems to occur in spurts of time.

• stabilizing selection

• gradualism

• disruptive selection

• puntuated equilibrium

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112.34.c.7.B