Question

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 they mate among themselves, they are rarely successful in producing offspring. What can you infer from this information?
a. Prezygotic isolation exists between the two frog species.
b. Postzygotic isolation exists between the two frog species.
c. The hybrids form a separate species under the biological species concept.
d. These two species are likely in the process of fusing back into one species.

Answer 1

Answer:

The correct answer is B.

Explanation:

Given there is a hybrid produced between two species Rana Ridibunda and Rana Lessonae and their offspring can not reproduce, this can mean there is "Postzygotic Isolation" between the said two species. Postzygotic Isolation is defined as "not being able to have fertile offspring" and that is the case in the example. I hope this answer helps.