Question

Give a suitable explanation for geographical isolation of individual of a species due to the formation of new species

Answer 1

it is actually due to geographical isolation that new species are created(or speciation takes place).
suppose for example there is a herd of buffaloes in the center of our country(India). a group of buffaloes in that herd agrees to migrate north and start living there for some reason(eg. mating etc).now due to the adverse geographical conditiobs and temparatures in the north it be a case that many buffaloes couldnt survive and ultimately died. but the ones that lived continued to breed. this caused variations in the subsiquent off springs and they developed charecteristics to resist heat,slowly but steadily , and in a couple of thousand years evolved as yaks. this is known as speciation.
now the ones that chose to live in the central (or the sub tropical regions), remaied to be called buffaloes and have developed only a little ,since there is no dramatic environmental changes(yet)...
hope this helped you
thanks..

Answer 2

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• Geographical isolation of a population leads to genetic drift and there will be no gene flow between it and the parents species. Inbreeding in small population will reproduce among themselves and generate new variations. Accumulation of those variations over several generations will lead to formation of new species.