The rate of speciation of an allopatric case would occur at a much slower rate than the sympatric case involving formation of allopolyploid offspring.
Groups from an ancestral population evolve into separate species due to a period of geographical separation in allopatric speciation. The evolution of a new species from a surviving ancestral species and both continue to inhabit the same geographic region in sympatric speciation. An individual having two or more complete sets of chromosomes derived from different species is said to be allopolyploid. The speed or pace of the emergence of new species is slow in allopatric speciation compared to sympatric speciation involving allopolyploid offspring.
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