Question

Assertion :The establishment of reproductive isolation is an event of biological significance. Reason: In the absence of reproductive isolation, species can merge back into single population.

• 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Reproductive isolation is the absence of interbreeding between members of different species. This results in isolation of gene pool of section of the population from rest inhibits gene flow ( a spread of genes between populations) and thereby leads to the formation of new species. Irrespective of rare frequency, all species exhibit particular range of genetic recombination among the individual which can lead to merging of individuals of different species. Hence, reproductive isolation maintains distinct identity of different lineages. Reproductive isolation also prevents spread of morphological changes, brought about by mutations, between different species. Hence reproductive isolation is mandatory to maintain distinct species and its absence can lead to merge of different species into one. Thus, the correct answer is option A.