why are variations essential for speciation ???
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Without variation there could not be evolution. Speciation is a result of evolution. Evolution works by selecting a portion of a population for continuation of the species. There would be not evolutionary change if the selected portion was identical to the not-selected portion.
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Speciation occurs from standing genetic variation when reproductive isolation between 2 or more populations evolves from alleles already present within the common ancestral population, rather than from new mutations. ... This seasonal difference contributes to strong (although still incomplete) reproductive isolation.
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