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Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Types of Selection01:46

Types of Selection

40.4K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
40.4K
Mismatch Repair01:20

Mismatch Repair

4.8K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.8K
Limits to Natural Selection01:38

Limits to Natural Selection

31.3K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
31.3K
Gene Flow02:39

Gene Flow

35.1K
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
35.1K
What is Natural Selection?01:32

What is Natural Selection?

115.1K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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相关实验视频

Updated: Jun 28, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

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选择下的祖先线上的突变过程.

E Baake1, F Cordero2, E Di Gaspero1

  • 1Faculty of Technology, Bielefeld University, Postbox 100131, 33501 Bielefeld, Germany.

Theoretical population biology
|April 19, 2024
PubMed
概括

这项研究分析了在人口遗传学中采样的个体的祖先线,揭示了选择偏差的突变率. 有益突变增加,有害突变减少,为进化过程提供了新的见解.

关键词:
这是祖先的血统.莫兰模型的模型突变过程是突变过程.人类遗传学和人口遗传学.修剪的查看下方的祖先选择图表.替换过程中的替换过程.

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

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Author Spotlight: Understanding Microbe Adaptation Using Innovative Techniques for Exploring Thermophilic Evolution
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Author Spotlight: Understanding Microbe Adaptation Using Innovative Techniques for Exploring Thermophilic Evolution

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相关实验视频

Last Updated: Jun 28, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

960
Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

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科学领域:

  • 人口遗传学 人口遗传学
  • 进化生物学 进化生物学
  • 人类遗传学 是一个学科.

背景情况:

  • 莫兰模型是研究种群遗传学的基本框架.
  • 了解抽样个体的祖先线对于进化推断至关重要.
  • 将种群遗传学与原始遗传学联系起来,需要分析长时间内的突变过程.

研究的目的:

  • 为了研究两种类型的莫兰模型与选择,在两种类型的莫兰模型中研究血统和突变过程.
  • 分析祖先线超越最近的共同祖先,将种群遗传与族系遗传联系起来.
  • 为了比较在选择条件下与中性条件下的突变动态.

主要方法:

  • 使用截减的下拉查看祖先选择图表来建模潜在的祖先.
  • 追溯一个随机抽取的个体的祖先线深入过去.
  • 分析沿着祖先线的突变率和偏差.

主要成果:

  • 沿着祖先线观察到对有益类型的普遍偏见.
  • 在选择下,有益突变的速率会增加.
  • 与中性进化相比,有害突变的速率在选择下降.

结论:

  • 选择显著改变了沿着祖先线的突变率,有利于有益的突变.
  • 这些发现为基系和基系基因突变率估计之间的差异提供了新的视角.
  • 这项研究强调了选择,突变和祖先在塑造遗传多样性的相互作用.