18) The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia. Both male and female hybrids exist, but when the hybrids mate with other hybrids or with adults of either species, they are rarely successful in producing offspring. What can you infer from this information? A) Postzygotic isolation exists between the two frog species. B) Prezygotic isolation exists between the two frog species. C) These two species are likely in the process of fusing back into one species. D) The hybrids form a separate species under the biological species concept.

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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18) The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana
ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across
central Europe to Russia. Both male and female hybrids exist, but when the hybrids mate with other
hybrids or with adults of either species, they are rarely successful in producing offspring. What can you
infer from this information?
A) Postzygotic isolation exists between the two frog species.
B) Prezygotic isolation exists between the two frog species.
C) These two species are likely in the process of fusing back into one species.
D) The hybrids form a separate species under the biological species concept.
19) 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.
Transcribed Image Text:18) The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia. Both male and female hybrids exist, but when the hybrids mate with other hybrids or with adults of either species, they are rarely successful in producing offspring. What can you infer from this information? A) Postzygotic isolation exists between the two frog species. B) Prezygotic isolation exists between the two frog species. C) These two species are likely in the process of fusing back into one species. D) The hybrids form a separate species under the biological species concept. 19) 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.
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