Directional selection is demonstrated in
a. the color of peppered moths in England.
b. the development of resistance to insecticides.
c. the development of resistance to antibiotics.
d. the coat color of rock pocket mice in Arizona.
e. all of these.
Answer: e
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The various endemic cichlid species of Lake Victoria have suffered losses in their population numbers and species due to the introduction of
A. the Nile crocodile. B. the Nile perch. C. a new algae species. D. a new ectoparasite that lives on the gills. E. a fish hawk.
The term angiosperm refers to
A. the narrow sperm of angiosperms. B. the enclosure of the seed within a fruit. C. the presence of endosperm. D. the branching of vascular veins. E. the presence of pollen.
During which stage of the cell cycle does the M checkpoint occur?
A. telophase B. metaphase C. S phase D. G1 E. prophase
The vectors of ________ are sand flies.
A. beaver fever B. Chagas' disease C. filariasis D. giardiasis E. leishmaniasis