分子分类的若干问题

SOME ISSUES IN MOLECULAR SYSTEMATICS

本文简要介绍了分子分类学中的几个重要问题：即，（１）分子分类法的优点及其局限性；（２）分子树和物种树的关系；（３）分子钟与分子分类法的关系；（４）核酸序列数据与蛋白质序列数据之比较；（５）ＭＰ、ＮＪ和ＭＬ法之比较；（６）分子树的可靠胜。另外还简要介绍了两个分子分类软件，ＰＨＹＬＩＰ和ＣＬＵＳＴＡＬＶ。

This article gives a brief introduction to several important issues in molecular systematics,that is,(1) advantages and limitations of molecular systematics;(2) relationship between molecular tree and species tree;(3) relationship between molecular clock and molecular systematics;(4) comparison of nucleotide sequence data and amino acid sequence data,(5) comparison of MP,NJ and ML method;(6) reliability of molecular tree.Two widely used softwares,PHYLIP and CLUSTAL V are briefly described.