Lab: Natural Selection-Standard Bio 4.2

Question 1

Check all statements below that are true.

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All organisms must compete for survival.; Some organisms have phenotypes that make them better competitors than others in their environment.; Natural selection continues to occur even today.; Phenotypes found in the most successful members of a species become the most prevalent after several generations.

Question 2

Look at the three beaks. Which flock’s birds have beaks that seem most likely to be able to pierce a piece of fruit?

Revolt · Accepted Answer

Flock X

Question 3

Suppose that a plant disease kills all the fruit. The change could become a on the birds.

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selective pressure

Question 4

Check all possible effects of this selective pressure.

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Flock X may try to eat other foods.; Flock X could migrate in search of fruit.; Flock X could slowly decrease in number.; Flocks Y and Z could benefit and increase.

Question 5

The birds shown above have beaks with three different shapes and sizes. These genetic variations in the beak each appeared initially due to

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mutations.

Question 6

In this lab, you will simulate birds with three different beaks. After watching the birds feed, you will remove fruit to simulate a change in the environment. What question are you answering by doing this observation? Write it by filling in the blanks below.What is the effect of…

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the type of food available

Question 7

…on…

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the bird population and the beak variations

Question 8

Check all correct elements below that you included in your question.

Revolt · Accepted Answer

The independent variable is the type of food available.; The dependent variable is the frequency of each type of beak (or number of birds with each beak type).

Lab: Natural Selection-Standard Bio 4.2 Answers

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