Selective Breeding Essay

Topics: Selective breeding, Breed, Breeding Pages: 3 (689 words) Published: May 22, 2013
Selective Breeding essay
Eugene Ng

Selective Breeding (also called artificial selection) is the process by which humans breed other animals and plants for particular traits. Typically, strains that are selectively bred are domesticated, and the breeding is normally done by a professional breeder. Bred animals are known as breeds, while bred plants are known as varieties, cultigens, or cultivars. The cross of animals results in what is called a crossbreed, and crossbred plants are called hybrids.

Plant breeding has been used for thousands of years, and began with the domestication of wild plants into uniform and predictable agricultural cultigens. High-yielding varieties have been particularly important in agriculture. Selective plant breeding is also used in research to produce transgenic animals that breed "true" (i.e., are homozygous) for artificially inserted or deleted genes. Over time, selective breeding modifies teosinte's few fruitcases into modern tomato's rows of exposed kernels.

In any given reason, reporting tomato could be lost to 10-15%. There was a bacteria that makes the tomato rotten. One day, a farmer received a phone call from a scientist, that had a way to prevent this things happen.

Bacterial Spot causes yield loss in tomato through reduced photosynthetic capacity and defoliation. Fruit quality is reduced indirectly due to sun-scald and directly by bacterial lesions. Bacterial spot of tomato is caused by as many as four species of Xanthomonas, including Xanthomonas euvesicatoria, X. vesicatoria, X. perforans, and X. gardneri (reviewed by Jones et al., 2004). In addition, at least five physiological races—T1–T5—are recognized on the basis of a hypersensitive (HR) reaction on a differential series of host genotypes (reviewed by Robbins et al., 2009). Descriptions of bacterial spot may use the species names, taxonomic groups A–D, or race designations. Several sources of resistance to bacterial spot have been identified. In...
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