A gene pool undergoes allopatric speciation when geographical distance, or a physical barrier such as a stretch of ocean, permits variation to grow such that gene flow across the population is permanently interrupted. Th... More »

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According to National Geographic, a good example of allopatric speciation is the formation of new squirrel species after the formation of the Grand Canyon. The geographic isolation of the squirrels at the north and south... More »

An example of sympatric speciation can be seen in the change in the egg-laying habits of the apple maggot, first observed in the early 19th century. The sympatric speciation of the apple maggot fly occurred as a result o... More »

Also referred to as gene migration, gene flow is the introduction of genes from one population to the gene pool of another population. This process changes the composition of the gene pool of the receiving population. Go... More »

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According to National Geographic, a good example of allopatric speciation is the formation of new squirrel species after the formation of the Grand Canyon. The geographic isolation of the squirrels at the north and south... More »

Genetic variation generally refers to the differences in genes between individual members of a population, or the frequency in which the various gene types are expressed. Genetic variation is incredibly important for the... More »

www.reference.com Science Biology Molecular Biology & DNA

Allopatric speciation is the division of species by geographical means. In the process of allopatric speciation, an extrinsic factor, or factors, prevents two or more groups of organisms from interacting or mating with e... More »

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