Natural Selection Warm-Up

Evolution occurs when a ______ experiences a change in __________ over time.

• population ; its gene pool

• population ; its environment

• individual ; its gene pool

• individual ; its environment

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An organism with a favorable adaption will ​ (a)   its fitness in the environment, so that the allele(gene) for that trait appears ​ (b)  

• increase
• decrease
• more frequently
• less frequently

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Which is NOT a factor that plays a role natural selection?

• The ability to survive into maturity

• The ability to reproduce succesfully

• The ability to pass on favorable traits

• The ability to be the top predator in an area

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A characteristic or feature that is tested by nature and increases an organism's ability to survive within a changing environment.

• adaptation
• hibernation
• migration
• mutation

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Natural selection often refers to survival of the fittest, which means nature favors organisms that _________________ in that environment.

• are the strongest

• are the fastest

• are the biggest

• fit in the best

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NGSS.MS-LS4-4

In sunflowers, being too short means not getting enough sunlight. Growing too tall means getting blown around by the wind. Medium height sunflowers tend to survive the best.

• Stabilizing Selection

  (0 extreme traits beneficial)

• Directional Selection

  (1 extreme trait beneficial)

• Disruptive Selection

  (2 extreme traits beneficial)

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Frogs with longer tongues are able to catch more food. Frogs with short tongues can't catch as much food and don't usually survive.

• Stabilizing Selection

  (0 extreme traits beneficial)

• Directional Selection

  (1 extreme trait beneficial)

• Disruptive Selection

  (2 extreme traits beneficial)

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NGSS.MS-LS4-4

Light colored cray fish are hard for a predator to see because they blend into the sand. Dark colored cray fish blend into the shadows cast by the rocks. Medium colors are most heavily eaten by predators.

• Stabilizing Selection

  (0 extreme traits beneficial)

• Directional Selection

  (1 extreme trait beneficial)

• Disruptive Selection

  (2 extreme traits beneficial)

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Organisms with the most beneficial traits in that environment will survive.  This is commonly known as

• theory of evolution.
• variations.
• survival of the fittest.
• ecosystems.

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If an environment changed as a result of an large migration of beetles into an area that started to eat up all the plants in that environment, then which finch would most likely adapt the best to the changing environment?

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