AIIMS 2017 Zoology Speciation MCQ Question
Reproductive isolation in sympatric speciation develops without a
geographic barrier
barrier to gene flow
change in chromosome number
barrier to mating
Correct Answer
Detailed Explanation
In sympatric speciation, reproductive isolation occurs within the same geographic area, meaning there is no geographic barrier (option A) that separates populations. Instead, reproductive isolation can arise through mechanisms such as behavioral differences, temporal isolation, or polyploidy (change in chromosome number, option C), which do not require physical separation. Options B and D are incorrect because sympatric speciation specifically involves a lack of barriers to gene flow and mating, allowing for the evolution of distinct species despite overlapping ranges.
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