Male mallard ducks have had emerald green head feathers and wings with metallic blue patches for hundreds of years, whereas females have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an example of ____.
A. directional selection
B. Polyploidy
C. allopatric speciation
D. disruptive selection
E. sexual selection
Answer: E
Biology & Microbiology
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