Question

Morphologically similar but reproductively isolated species are called as

• A. Synchronic species
• B. Sibling species
• C. Allopatric species
• D. Sympatric species

Answer 1

The correct option is B Sibling species

Species that belong to same period are termed as synchronic species; option A is incorrect. Two morphologically identical species that do not interbreed are referred to as sibling species; for example Drosophila pseudobscula and D. persimilis are sibling species that do not interbreed. Option B is correct. Reproductive isolation brought about by geographical isolation creates allopatric species which are now present in different geographical regions. Individuals of a population present in same geographical area are reproductively isolated by polyploidy and forms new species termed as sympatric species. This makes options C and D incorrect as they are the groups belonging to same or different geographical area and the question is about reproductive isolation within morphologically similar individuals. Thus, the correct answer is option B.