HHMI Natural Selection

How did the environment change between time 1 and time 2? How did the population change?

• You cannot tell how the environment changed. With each generation, more squirrels passed on the gene for black fur to their offspring.

• There were more black trees. Squirrels with black fur are more likely to survive, so the squirrels with gray fur changed to have black fur.

• There were more black trees. Squirrels with black fur are more likely to survive, so both types of squirrels passed on the gene for black fur to their offspring.

• There were more black trees. With each generation, more squirrels with black fur survived long enough to pass on the gene for black fur to their offspring.

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The phrase "Survival of the Fittest" would best describe...

• Natural selection

• Artificial selection

• Selective breeding

• None of the above

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Who was the naturalist that traveled the world to study plants and animals?

• Albert Einstein

• Charles Darwin

• Charles Barkley

• Isaac Newton

A green rat snake that lives in the grass and a brown rat snake that lives in the desert is a form of ______________.

• Human Genetic Modification

• Selective Breeding

• Natural Selection

• Artificial Breeding

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A fox with thicker fur than average would have a survival advantage over other foxes if:

• There is more competition for food in the fox population.

• The air temperature significantly decreases in winter.

• A drought occurs, limiting the amount of water available.

• A new disease appears that infects the foxes.

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What is the advantage of having different shaped beaks?

• To look different from other species.

• To protect itself against predators.

• To protect itself against prey

• To be able to eat the food readily available in the environment.

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How does waterproof feathers help penguins survive in the Antarctic. (Choose all that apply)

• Helps keep them warm and dry

• Helps them blend in

• Helps them swim in cold waters

• Helps them see further in cold weather

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A variation is . . .

• when organisms have camouflage like spots or stripes

• an organism from a different dimension

• when you order different food than your friend

• differences between organisms in the same species

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How do you "win" at natural selection?

• survive

• go extinct

• survive & reproduce

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Adaptations can be:

• camouflage

• ability to survive cold weather

• hunting skills

• all of the above

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