Biology (Raven), 10th Edition

Chapter 22: The Origin of Species

Pre-Test

1
Species that occur in the same area are called
A)hybrids.
B)polyploids.
C)reinforcement.
D)allopatric.
E)sympatric.
2
Which of the following is key to the biological species concept?
A)Stasis
B)Geographical isolation
C)Reproductive isolation
D)Intermediate populations
E)Asexual reproduction
3
Ernst Mayr set forth the_______, which defines species as ". . . groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups."
A)theory of natural selection
B)sympatric species concept
C)biological species concept
D)Darwin-Mayr concept of rapid speciation
E)Parapatric species concept
4
Suppose you find two sympatric species of bird that mate readily in the laboratory and produce fertile offspring, but appear to be distinct species in nature. This would indicate that:
A)they also interbreed freely with each other in nature but this has just not been observed.
B)they are in fact the same species.
C)there are pre-zygotic isolating mechanism that keep them reproductively isolated.
D)the biological species concept is inadequate in this instance.
E)both 1 and 2
5
Two distinct species of fish are very similar in appearance when they are allopatric, but when they are sympatric there are considerable differences in color pattern. What is the most likely cause of this?
A)They are hybrids.
B)Reinforcement of isolating mechanisms.
C)Selection by predators.
D)Coincidence.
E)Environmental selection forces at work.
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