Question

Two species which are morphologically almost identical but they do not interbreed. Such species are called as

• A. Evolutionary species
• B. Sibling species
• C. Polytypic species
• D. Evolutionary trend
• E. None of the above

Answer 1

The correct option is B Sibling species

Sibling species are species that are very similar in appearance, in behaviour and in other characteristics, but they are reproductively isolated, meaning that while they may interbreed, the offspring cannot reproduce.
Sibling species may arise as a result of allopathic speciation through geographic isolation, parapatric speciation or sympatric speciation. Sibling species are in fact, separate biological species. Thus, the correct answer is option B.