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Essay / Research Paper Abstract
A 3 page overview of the process of natural selection. The author details how natural selection influenced speciation in Darwin's finches and in man himself. Bibliography lists 2 sources.
Page Count:
3 pages (~225 words per page)
File: AM2_PPnatSel3.rtf
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Unformatted sample text from the term paper:
Natural selection is a mechanism through which evolution works. The theory of natural selection specifies that it is the organism which is
best adapted for its particular ecological niche which survives to pass its genetic material on to subsequent generations. This process entails that each successive step in the evolutionary path
of an organism must be comprised of a precise and intricate fit of organism to environment. It is largely the result of natural selection through which speciation occurs.
Darwin, of course, is credited with first describing the theory of natural selection. He based his work primarily on the morphological differences that he
noted in the finches of the Galapagos Islands. Darwin hypothesized that beak morphology in specific species of these finches played a role in their speciation. Two species of
these birds, two of the fourteen species of finches living on the Galapagos Islands, both fed on the seeds of one plant, Tribulus cistoides (Grant and Grant, 1996). Each
exhibited adaptations, however, which allowed them to capitalize on either the large or the small seeds of this plant (Grant and Grant, 1996). Geospiza fortis utilized the smaller seeds
of the plant while the Geospiza magnirostris utilized the larger seeds (Grant and Grant, 1996). According to Darwin new variants of
finches were derived from a common ancestor and these variants arose continuously within the population. In the case of these specific finches their most obvious feature which allowed
them to capitalize on a specific environment niche was their beak morphology. An analysis of contemporary research on the islands supports that contention.
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