Suggest how the two sub-species have developed from a single ancestral population.

Two populations become separated by a barrier such as sea (geographical separation). As a result populations cannot interbreed, hence gene flow between two populations is prevented. As a consequence, only a small number of species are breeding (the founder effect) leading to a limited variety of allels. Gene mutations take place; there are different environmental conditions and selection pressures leading to changes in the allele frequency. This leads to physical and physiological changes and hence allopatric (geographic) speciation.

Answered by Maja S. Biology tutor

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