Biology 3466B Study Guide - Azide, Dopamine Receptor, Exaptation
9 Nov 2012
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Document Summary
A growing body of evolution, concluded by darwin, indicated both fossilized and living organisms were derived from a common ancestor or a few. Darwin studied mechanism of nature under domestication; method plant and animal breeders use to modify crops and livestock. In order to refine a particular breed of pigeon that has, for example, taller feathers or feathers curl more elegantly, breeders employ artificial selection. They choose pigeons from the flock with the desirable traits, let them mate to produce next generation. If the desirable traits are passed from parent to offspring, the next generation will show the desirable traits in a higher proportion than existed in the previous generation"s flock. This theory helps to prove the descent of giant tomatoes versus small tomatoes. On chromosome 2 of tomatoes, a gene called fw2. 2 is carried. This gene encodes a protein that represses cell division; high production of this protein, smaller the fruit.
