canvas.pasadena.edu Quiz: UnitE ed: Apr 4 at 7:56pm iz Instructions have 75 minu

Question

canvas.pasadena.edu Quiz: UnitE ed: Apr 4 at 7:56pm iz Instructions have 75 minutes to complete the exam. Please see the study guide to prepare for the possible open en stions ahead of time as they require peer reviewed sources. Plan your time carefully Question 11 1 pts After an earthquake, a small group of beetles from a much larger population becomes trapped in a cave. They are able to persist (continue living and reproducing) in the cave, but they cannot migrate back to the source population outside the cave. What would most likely result from this scenario? Sympatric speciation OExtinction of the species Gene flow Next Previous Quiz saved at 8:22pmSubmit Quiz

Explanation / Answer

Ans. Correct option- C. Allopatric speciation. Note that a group of organisms are isolated from main population by cave (geographical means). The ecosystem of mainland is quite different from that of the cave. Since the beetles continue to reproduce, they may form a new species after sufficiently long time through natural selection. The process of evolution of a new species as a result of geographical isolation is called allopatric speciation.

So, the beetles in cave are most likely to exhibit allopatric speciation.

# Option A. Incorrect. Sympatric speciation is the evolution of a new species WITHOUT geographical isolation in the same ecosystem/niche.

Since geographical isolation is mentioned in case of beetle, they don’t exhibit sympatric speciation.

# Option B. Incorrect. Since the beetle continue reproducing in the cave (new ecosystem/niche), the don’t extinct.

# Option D. Incorrect. Gene flow is the transfer of genetic variations (genes/allele) between two populations. Since beetles are geographically isolated in the cave, they can’t exchange genes with the mainland beetle population. So, gene flow is NOT possible in this case.

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