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Question

A and B were organisms who belonged to the same species. After generations, due to certain factors, their descendants were not able to interbreed. What all could be the possible reasons for the same?
  1. Severe DNA changes
  2. Variations
  3. Geographical isolation
  4. All of the above.


Solution

The correct option is D All of the above.
  • Speciation is the process by which populations evolve to become new and distinct species. This can happen due to geographical and reproductive isolation.
  • Geographic Isolation occurs when two populations of the same species are divided by some physical barrier, due to which they get separated.
  • To adapt to new conditions there are variations and severe DNA changes in A and B respectively due to which they become distinct.
  • Now, when they come in contact with each other they fail to recognise each other (behavioral isolation) and become reproductively isolated.

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