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相关概念视频

Phylogenetic Trees03:21

Phylogenetic Trees

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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Phylogeny01:23

Phylogeny

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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Graphs of Equations in Two Variables01:30

Graphs of Equations in Two Variables

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An equation with two variables, typically written in the form y = f(x) or Ax + By = C, describes a relationship between quantities represented by x and y. Each solution to such an equation is an ordered pair (x, y) that satisfies the equation when substituted. These pairs can be represented graphically to understand the variables' relationship visually.A common technique for constructing the graph of a two-variable equation is to create a value table. Begin by choosing several values for the...
191
Graphical Representation of Inequalities01:28

Graphical Representation of Inequalities

172
The graph of the equation where y equals x squared forms a curve known as a parabola. This curve acts as a boundary in the coordinate plane, dividing it into distinct regions based on the relative position of points.When the equality sign in the equation is replaced with an inequality—such as greater than, less than, greater than or equal to, or less than or equal to—the graphical representation changes from a single curve into a broader shaded area that signifies the set of all...
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

8.0K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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相关实验视频

Updated: Jan 15, 2026

Inherent Dynamics Visualizer, an Interactive Application for Evaluating and Visualizing Outputs from a Gene Regulatory Network Inference Pipeline
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Inherent Dynamics Visualizer, an Interactive Application for Evaluating and Visualizing Outputs from a Gene Regulatory Network Inference Pipeline

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为推断四叶半导向的基因网络的代数不变量.

Samuel Martin1,2, Niels Holtgrefe3, Vincent Moulton4

  • 1European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom.

Systematic biology
|October 15, 2025
PubMed
概括
此摘要是机器生成的。

本研究提出了一种代数方法,用于从核酸序列推断半导向的遗传学网络. 该方法准确地识别了具有10kbp序列的非定向网络和具有10Mbp序列的半定向网络.

关键词:
遗传遗传网络是一个遗传遗传网络.遗传学上的不变体是基因不变的.半定向网络 半定向网络

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A Practical Guide to Phylogenetics for Nonexperts
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相关实验视频

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A Practical Guide to Phylogenetics for Nonexperts
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科学领域:

  • 进化生物学是进化的生物学.
  • 计算型的遗传学学.
  • 生物信息学是一种生物信息学.

背景情况:

  • 遗传学旨在利用序列数据重建物种的进化历史.
  • 遗传学网络模拟复杂的进化事件,但难以推断.
  • 半导向的族系遗传网络越来越受到人们的兴趣,它们通常是通过结合较小的网络来构建的.

研究的目的:

  • 研究一种代数方法来推断半导向的遗传学网络.
  • 分析树叶图案概率,以推断家族遗传网络.
  • 用不同的序列长度来评估方法的准确性.

主要方法:

  • 利用代数方法分析叶子模式概率.
  • 应用该方法从核酸序列推断出4叶半导向的遗传网络.
  • 在模拟数据和Xiphophorus物种的真实数据集上测试了该方法.

主要成果:

  • 准确识别未定向的家族遗传网络,其序列>= 10kbp.
  • 准确识别半导向的基因网络需要序列接近10Mbp.
  • 成功识别了树状进化和底层树木,并应用于Xiphophorus数据.

结论:

  • 代数方法对于推断家族遗传网络,特别是非定向网络是有效的.
  • 推断半定向网络更为数据密集,需要更长的序列.
  • 这种方法对于模拟和现实世界上的遗传学分析都是有价值的.