Question

Assertion :Reproductive isolation brings about sympatric speciation. Reason: It is the primary mode of speciation. e.g., Darwin's finches.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

• Speciation occurs due to reproductive isolation. This can be caused by mating differences, sterility or environmental barriers that eventually lead to the adaptive splitting into two species.
• Reproductive isolation is the inability of a species to breed successfully with related species due to geographical, behavioral, physiological or genetic barriers.
• Sympatric speciation refers to the formation of two or more descent species from a single ancestral species all occupying the same geographic location. It also results from sexual conflict.
• Darwin's finches are an example of allopatric speciation which is the dominant mode of speciation.
• It occurs when a species separates into two separate groups that are isolated from one another.
  So, the correct option is B.