All GRE Subject Test: Biology Resources
Example Questions
Example Question #1 : Speciation
Which of the following refers to speciation that results from physical barriers such that biological populations become isolated?
Sympatric speciation
Natural selection
Allopatric speciation
Disruptive selection
Parapatric speciation
Allopatric speciation
The correct answer is allopatric speciation. Sympatric speciation occurs when two biological populations inhabit the same geography, but speciate due to behavorial differences. Parapatric speciation occurs when there is a small hybrid zone or overlap of two biogeographically distinct populations. Disruptive selection and natural selection do not explain events of speciation in the context of the question.
Example Question #2 : Speciation
Which of the following refers to speciation that occurs due to reproductive isolation in populations that occupy the same geographical area?
Parapatric speciation
Allopatric speciation
Balancing selection
None of the other answers
Sympatric speciation
Sympatric speciation
The correct answer is sympatric speciation. Although rare, sympatric speciation occurs in populations that occupy the same geography, but still develop reproductive isolation. This isolation is generally driven by behavioral differences. Allopatric speciation occurs in biogeographically distinct populations. Parapatric speciation occurs when there is a small hybrid zone or overlap of two biogeographically distinct populations. Balancing selection refers to a mode of natural selection, not speciation.
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