系统树

Thus, a phylogenetic tree is based on a hypothesis of the order in which evolutionary events are assumed to have occurred.

因此，系统树是基于对进化事件发生顺序的假设。

The ITS sequences contain many variable sites and phylogenetical informative sites among related species of genus Vigna and phylogenetic relationships among species could be established succesfully.

美洲来源的聚为一类，它们的遗传距离较远，大多在20％左右，遗传多样性较高，位于系统树的最基部，可能为较原始起源的种。

Results From the phylogenetic tree of acitns in fungi Pneumocystis carinii and Schizosac-charomyces pombe are in an early branch of Ascomycota.

结果 三种蛋白的分子系统树都支持了将卡氏肺孢子虫作为子囊菌的早期分支古子囊菌的分类观点。

China. The inflorescences of sect. Macranthae are defined as bearing (1-) 2-many umbels racemosely on the peduncle with a prophylla at base.

基于分了序列的系统树，显示圆锥菝葜组并不是一个单系类群，部分种处在不同分支中并与来自其它组的种聚在一起。

Cladistics is the current method of choice to infer phylogenetic trees.

遗传分类学是当前推断系统树的首选方法。

Cultivars. Based on UPGMA cluster analysis, a DNA molecular dendrogram was established.

实验采用UPGMA方法进行聚类分析，并在此基础上建立分子系统树。

PopGene 32 software was applied to conduct the cluster analysis and genetic dendrogram establishment.

应用CTAB法提取DNA，采用PopGene32软件进行聚类分析，并构建遗传系统树。

We studied 32 crested ibises from Yong county and 5 crested ibises from Beijing Zoo by RAPD.

由于RAPD技术具有简便、迅速且无须了解研究对象的分子信息等优点，因而广泛应用于系统树构建、遗传多样性研究等众多的领域。

Phenetics, popular in the mid-20th century but now largely obsolete, uses distance matrix-based methods to construct trees based on overall similarity, which is often assumed to approximate phylogenetic relationships.

表现型分类法在20世纪中叶流行，但现在基本上已经过时；它是用基于距离矩阵的方法，在大体相似的基础上构建系统树；大体相似往往被假定为亲缘关系接近。

You can now change this Cyl surface in the System Tree by right mouse clicking inside the main viewing window.

您在系统树能由点击在主要观察孔里面的正确的老鼠现在改变这Cyl表面。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失