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Will geographical isolation be a major f...

Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?

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Geographical isolation can prevent the transfer of pollens among different plants. However, since the plants are self pollinating, which means that the pollens are transferred from the anther of one flower to the stigma of the same flower or of another flower of the same plant, geographical isolation cannot prevent speciation in this case.
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(i) A husband has 46 chromosomes, his wife has 46 chromosomes. Then why don't their offsprings have 46 pairs of chromosomes, which is obtained by the fusion of male and female gametes? (ii) "Geographical isolation is not a major factor in the speciation of a self pollinating plant species." Justify this statement with the help of an example.

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