Gene Flow

Gene Flow When individuals move between genius state and a nonher, naked as a jaybird divisors whitethorn be introduced to populations. This phenomenon, known as gene flow, results from nonice dispersal as well as intentional migration. Take, for example, cardinal populations of related wild flowers, ace and only(a) red and one white, separated by a tremendous tract of land. Under normal circumstances, the 2 groups do not interbreed because the move does not daze hard comme il faut to carry pollen between the populations so that pollenation can occur. If one day an unusually strong wind carries pollen from the red wildflower population to the white wildflower population, the gene for red flowers may be introduced to the white populations gene pool. In many animals, gene flow results when individuals from one population emigrate to another population. The Lake Erie water snake provides an nice example. Although skilled swimmers, these snakes communicate much of th eir day basking in the sunniness on overhanging phytology or rocks. In Lake Erie, water snakes ashes distinct populationssnakes that belong on the rock islands in the lake, and others that live in the ve put upation stodgy to the margin.

Shore populations have old bodies with black bands, a colour that helps them evade hungry seagulls by blending with the shoreline vegetation. Island snakes are chiefly light gray with no banding, coloring that helps them to blend in to their rocky surroundings. An easy bell ringer for seagulls, tie island snakes seldom survive to reproductive age. Yet every year, biologists count banded newborns among the island litt! ers. What at first appeared to be a mystery was by and by revealed to be gene flow at work. Although the populations do not regularly interbreed, once in a while shore snakes, carried by currents or winds, migrate to the islands. one time there, they familiar with island snakes, reintroducing the gene for banding into the island population as they do.If you ask to get a full essay, order it on our website: BestEssayCheap.com

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