Gene Duplication
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Gene duplication (or chromosomal duplication or gene amplification) is a major mechanism through which new genetic material is generated during molecular evolution. It can be defined as any duplication of a region of DNA that contains a gene; it may occur as an error in homologous recombination, a retrotransposon|retrotransposition event, or duplication of an entire chromosome. The second copy of the gene is often free from purifying selection|selective pressure — that is, mutations of it have no deleterious effects to its host organism. Thus it accumulates mutations faster than a functional single-copy gene, over generations of organisms. A duplication is the opposite of a Deletion (genetics)|deletion. Duplications arise from an event termed unequal crossing-over that occurs during meiosis between misaligned homologous chromosomes.The chance of this happening is a function of the degree of sharing of repetitive elements between two chromosomes. The product of this recombination are a ...
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相关概念
Genetics    
Gene Family    
Gene Order    
Large Scale    
演化趋势
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Gene Duplication文章数量变化趋势

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