Male mallards have had emerald green head

feathers and wings with metallic blue patches
for hundreds of years, whereas female mallards
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.


E

Biology & Microbiology

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