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相关概念视频

Frequency-dependent Selection01:21

Frequency-dependent Selection

21.9K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
21.9K
Types of Selection01:46

Types of Selection

40.3K
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...
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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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Speciation Rates01:07

Speciation Rates

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Overview
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Genetic Drift03:33

Genetic Drift

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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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What is Natural Selection?01:32

What is Natural Selection?

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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 16, 2025

Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies
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Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies

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在野生昆虫中,年龄之间波动的选择.

Rolando Rodríguez-Muñoz1, Paul E Hopwood1, Jon Slate2

  • 1Centre for Ecology & Conservation, University of Exeter, Penryn Campus, Penryn, United Kingdom.

Evolution; international journal of organic evolution
|March 4, 2025
PubMed
概括

自然选择中的变异对于理解进化至关重要. 一项对野 (Gryllus campestris) 的10年研究揭示了各种特征的选择压力每年发生显著的变化,突出了野生种群进化的动态性质.

关键词:
格里卢斯·坎佩斯特里斯 (Gryllus campestris) 是一种的植物.遗传变异是一种遗传变异.寿命长度 寿命长度匹配率的匹配率是多少多夫多妻制是什么意思 多夫多妻制是什么意思选择梯度梯度的选择.

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Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences
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Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences

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Small-Cage Laboratory Trials of Genetically-Engineered Anopheline Mosquitoes

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相关实验视频

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科学领域:

  • 进化生物学 进化生物学
  • 生态生态学 生态生态学
  • 动物行为 动物行为

背景情况:

  • 选择中的时间和空间变化可以解决诸如静止和遗传变异维护等进化难题.
  • 野生无脊椎动物的多代选择数据有限,尽管它们可能对环境变化敏感.
  • 短命的生态热植物被假设会经历更大的代际环境变化,使选择动态显著.

研究的目的:

  • 研究野生无脊椎动物群体中选择压力的多代变异.
  • 在田间板种群中,在十年内对多种特征量化选择梯度.
  • 为了确定选择的方向性是否因环境变化而在几代之间波动.

主要方法:

  • 一个个别标记的Gryllus campestris群体进行了为期10年的实地研究.
  • 利用133个昼夜视频摄像头的网络,收集了超过100万小时的行为和生活史数据.
  • 使用遗传标记来测量个体健康 (成年后代数量) 并计算出出现日期,身体大小和寿命等特征的选择梯度.

主要成果:

  • 观察到种群中多种特征的多年选择梯度的实质性变化.
  • 记录了平均特征值的每年显著差异,包括成人出现日期,身体大小和寿命.
  • 发现了在研究期间,成年人出现日期的选择从阳性转为负的证据.

结论:

  • 选择梯度的波动在野生无脊椎动物种群中似乎很常见.
  • 虽然选择可以从一年到一年大大变化,但选择方向的完全逆转可能很少发生.
  • 这项研究提供了关于野生无脊椎动物选择的关键的长期,多代数据,为进化理论提供了信息.