Natural Selection Chapter 2

1. Look at Diagram 1. How could you describe this newt population?

• There are fifteen poison levels shown, and each individual has a different amount of poison.

• There is one poison level shown, and all newts have the same amount of poison.

• There are three poison levels shown, and no poison-level trait is more common than the others.

• There are three poison levels shown, and one poison-level trait is the most common.

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2. 3. Look at Diagram 2. Did SOME newts from all poison levels die? (Xs over the newts mean they died)

• YES

• NO

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Last week we investigated the relationship between the length of time an ostrilope lived and how much it reproduced. Which of the following statements is CORRECT?

• Ostrilopes that lived longer had more offspring.

• Ostrilopes that died quicker had more offspring.

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Last week we did a SIM where we investigated which color ostrilope would survive and reproduce in a Yellow 7 environment more. What did we find out? Which color survived and reproduced more?

• Blue 1

• Blue 4

• Yellow 7

• Yellow 10

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If this trend continued, which color ostrilope would become more common in the population over time?

• Blue 1

• Blue 4

• Yellow 7

• Yellow 10

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If this trend continued, which color ostrilopes would become LESS common in the population over time?

• Blue

• Yellow

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Claim: Ostrilopes with adaptive traits are more likely to reproduce than ostrilopes with non-adaptive traits. Did we decide this claim was CORRECT or INCORRECT?

• Correct

• Incorrect

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2. How do you think the environment change between time 1 and time 2? How did the population change?

• The environment became brown. Brown foxes are more likely to survive, so the white foxes changed to have brown fur.

• The environment became brown. Brown foxes are more likely to survive, so both kinds of foxes passed on the gene for brown fur to their offspring.

• The environment became brown. With each generation, more brown foxes survived long enough to pass on the gene for brown fur to their offspring.

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Cactuses with longer spines are less likely to be eaten by sheep. If their environment changes to have many bighorn sheep, which of the following cactus populations will most likely survive?

• Populations 1 and 2 will most likely survive.

• Populations 2 and 3 will most likely survive.

• Only Population 2 will survive because it is the only population with variation.

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Blue jays with thinner beaks can easily reach and eat the seeds inside pinecones. If their environment changes to have only seeds in pinecones, which of the following blue jay populations will most likely survive?

• Populations 1 and 2 will most likely survive.

• Populations 2 and 3 will most likely survive.

• Only Population 2 will survive because it is the only population with variation.

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