生物的遗传和变异是由遗传物质所引起的,生物的遗传物质主要是DNA,与DNA有关的知识是掌握遗传和变异知识的基础。如DNA作为遗传物质的实验证据、DNA分子的结构、DNA的复制、基因的概念、基因指导蛋白质的合成,以及基因与性状的关系等,这些知识在高考中也是常考的内容,因此,强化对本专题的复习就显得非常重要。 Biological genetics and variation are caused by genetic material, biological genetic material is mainly DNA, and DNA-related knowledge is the basis for knowledge of genetic and mutation. Such as DNA as experimental evidence of genetic material, the structure of DNA molecules, DNA replication, the concept of genes, genes guide the synthesis of genes and genes and traits, etc., these knowledge in the college entrance examination is often test content, therefore, strengthen The review of this topic is very important.