Question

Why is reproductive isolation required for speciation to occur?if populations can interbreed, they are considered one species.if populations can interbreed, they do not exchange genetic information.reproductive isolation is not required for speciation because most different species can interbreed.reproductive isolation is not required for speciation because species are not defined by reproduction

Answer 1

The correct answer of the given question above would be the first option. Reproductive isolation is required for speciation to occur because if populations can interbreed, they are considered one species. Hope this is the answer that you are looking for. 

Answer 2

Answer: The correct answer is - If populations can interbreed, they are considered one species.

According to the biological species concept, organisms capable of interbreeding with each other and producing viable fertile offsprings belong to same species.

Speciation is an evolutionary process in which organisms evolve and form new species.

Thus, for speciation ( formation of new species), reproductive isolation would be required as otherwise the organisms will be considered as same species.