PCR是一种体外迅速扩增DNA片段的技术,它能以极少量的DNA为模板,在几小时内复制出上百万份的DNA拷贝。这项技术有效地解决了因为样品中DNA含量太低而难于对样品进行分析研究的问题,被广泛地应用于遗传疾病的诊断、刑侦破案、古生物学、基因克隆和DNA序列测定等各方面。近年来,有关PCR引物的考查成为高考生物“基因工程” PCR is a rapid amplification of DNA fragments in vitro technology, it can use a very small amount of DNA as a template, copies of millions of copies of DNA in a few hours. This technology effectively solves the problem that it is difficult to analyze the sample because the DNA content in the sample is too low. It is widely used in the diagnosis of genetic diseases, criminal investigation, paleontology, gene cloning and DNA sequencing. In recent years, the test of PCR primers into the college entrance examination biology “genetic engineering ”