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17-09-2019
Biology

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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. isolation by dispersal
B. isolation by vicariance
C. 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

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silgoni17 silgoni17

17-09-2019

Answer:

B. isolation by vicariance

Explanation:

This event is an example of isolation by vicariance because a new geographical barrier (the river) separated a previous population and generated multiple new ones.

On the other hand, an event of isolation by dispersal occurs when a wide population is separated by an already existent barrier, for example, a group of these ants that crosses the river (by any kind of transport) and settles in the shore.

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