Two species of antelope ground squirrels are separated by the Grand Canyon. They are hypothesized to descend from a common ancestor, populations of which were separated as the canyon formed. If this hypothesis is correct, it would be an example of:
A. allopatric speciation by dispersal.
B. allopatric speciation by vicariance.
C. peripatric speciation by vicariance.
D. sympatric speciation by dispersal.
E. sympatric speciation by vicariance.
B
You might also like to view...
When DNA is replicated, ____
a. parental histones are degraded and entirely replaced by new histones b. DNA is permanently freed from histone binding
c. the histone proteins are also replicated d. only some of the histone proteins are replicated e. the number of histones that bind to each DNA molecule is halved
Identify the site indicated by the arrow in the diagram
a. complement binding site of an antibody b. antigen binding site of an antibody c. MHC binding site of an antigen d. complement binding site of T cell receptor e. MHC binding site of a T cell receptor
Reptiles resemble __________ in being able to
__________. a. ray-finned fishes; freely leave the water b. birds; breathe by use of lungs c. ostracoderms; utilize their jaws d. amphibians; exchange gases across their skin e. lobe-finned fishes; exchange gases across their gills
The principal mineralocorticoid is:
a. ADH. b. epinephrine. c. growth hormone. d. aldosterone. e. ACTH.