Question

A major source of speciation is

• A. Hybrid breakdown
• B. Gene flow
• C. Mutation
• D. Geographical isolation

Answer 1

The correct option is D Geographical isolation

• Although hybridization and mutation are also involved in speciation, the most accurate answer to the question according to Darwinism is geographical isolation.
  
• In geographical isolation, a group of individuals of a species may become geographically isolated from other members or the species. So, both these groups grow in different environment and hence evolve to form new species due to stopped gene flow.
  

So, the correct option is 'Geographical isolation'.