There is an island in the middle of a large river that houses a large population of ants. Damming of the river causes the island to flood and only the highest points of the island are now above water. The ants cannot swim, so are now in multiple isolated populations. Which of the following best describes this event?
A) This situation represents isolation by dispersal.
B) This situation represents isolation by vicariance.
C) This situation represents a form of sympatric speciation.
D) Only a rare development of polyploidy could lead to speciation in this case.
E) Speciation will not occur in this case because of gene flow.
Answer: B
You might also like to view...
Human cancer causing viruses most often have a ________ genome.
A. ssDNA B. dsRNA C. ssRNA D. dsDNA
Which of the following features is characteristic of all
life? a. organization of molecules into cells b. metabolic control using enzymes c. a continuous flow of sustaining energy d. DNA with its hereditary code e. all of these
Members of separate populations of the same species cannot interbreed.
a. true b. false
The all-or-none reaction means that:a
if a stimulus is strong enough, all axons in a nerve bundle will fire simultaneously. b. a neuron will only produce an action potential if it has been depolarized to its threshold level. c. all neurons discharge impulses at the same frequency. d. a neuron can create an action potential of varying intensities. e. either all or none of the neurons will fire impulses when stimulat