BIO - Unit 7.2: Natural Selection

Adaptations can be:

• camouflage

• ability to survive cold weather

• hunting skills

• all of the above

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Natural selection occurs during the lifetime of a single organism.

• True

• False

How do you "win" at natural selection?

• survive

• go extinct

• survive & reproduce

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Due to pollution, a pond becomes darker over time. Which trait variation became more common?

• light fish

• dark fish

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Why are advantageous traits more likely to be passed onto offspring?

• Because they are more likely to survive and reproduce.
• Because they come from dominant alleles.
• Because they come from recessive alleles.
• Because the trait is an acquired phenotype.

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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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Change in a population over time that descend from a common ancestor.

• Natural Selection

• Selective Breeding

• Homeostasis

• Evolution

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The trees these moths used to live on were white, but have been covered in soot from coal factories. Which moth will be more successful in this environment?

• Dark moth
• Light moth
• Both will be equally successful
• Neither will be successful

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Definition: adaptation

• inherited characteristic that increases chances of survival
• organisms with traits well suited to their environment survive and reproduce at a greater rate
• a growing population causes a scarcity of resources
• differences in the DNA sequence

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Robins typically lay fours eggs. If more then four eggs are produced then the baby chicks are malnourished while smaller egg numbers result in no viable (able to live) baby chicks. This is an example of

• stabalizing

• disruptive

• directional

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