Triticum aestivum , a hybrid formed by doubling of chromosomes, is an example of ___________.

Step-by-step solution

Triticum aestivum (bread wheat) is an allohexaploid plant that originated through hybridization between different species followed by chromosome doubling (allopolyploidy). Since this process of forming a new species occurs in the same geographical area as the parent species without any geographical isolation, it is a classic example of sympatric speciation. Answer: Sympatric speciation