Genetic Variation Video Lessons

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Problem: In crossbill birds the beaks have a specialized shape to allow the crossbills to extract pine seeds out of cones. Crossbills in one forest feed on two different pine species. For one kind of cone a long thin beak is most efficient while in the other type of cone a short thick beak is most efficient. What evolutionary force is likely happening on beak shape?a. disruptive selection                    b. genetic driftc. gene flowd. intrasexual selectione. frequency dependent selection

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Problem Details

In crossbill birds the beaks have a specialized shape to allow the crossbills to extract pine seeds out of cones. Crossbills in one forest feed on two different pine species. For one kind of cone a long thin beak is most efficient while in the other type of cone a short thick beak is most efficient. What evolutionary force is likely happening on beak shape?

a. disruptive selection                    

b. genetic drift

c. gene flow

d. intrasexual selection

e. frequency dependent selection

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