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相关概念视频

Speciation Rates01:07

Speciation Rates

21.1K
Overview
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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
6.1K
Genetics of Speciation02:16

Genetics of Speciation

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Cis-regulatory Sequences02:02

Cis-regulatory Sequences

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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
9.8K
The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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相关实验视频

Updated: Jun 15, 2025

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks
08:51

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks

Published on: May 13, 2016

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复制的功能进化在虫适应辐射的复制功能进化.

Christopher M Martinez, Katherine A Corn, Sarah Williamson

    The American naturalist
    |August 23, 2024
    PubMed
    概括
    此摘要是机器生成的。

    虫适应性辐射显示了早期特征的快速演变,功能多样性模式反映了非洲湖泊的年龄. 然而,较古老的新热带辐射显示了类似但不同的进化轨迹.

    关键词:
    适应性辐射适应性的辐射类动物 类动物几何形态形态测量是几何形态的.动力学是动力学.形态学 形态学 形态学

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    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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    Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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    Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

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    相关实验视频

    Last Updated: Jun 15, 2025

    Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks
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    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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    Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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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
    • 鱼类学 鱼类学 鱼类学

    背景情况:

    • 适应性辐射提供了对物种和特征多样化机制的见解.
    • 了解这些多样化模式的可预测性对于进化研究至关重要.

    研究的目的:

    • 通过不同的适应性辐射来研究类物种的功能和形态多样化.
    • 为了比较非洲大湖不同年龄的辐射和新热带辐射的多样化模式.

    主要方法:

    • 分析了1110个高速视频中的吸食行为.
    • 研究来自维多利亚湖,马拉维湖,坦加尼加湖和新热带地区辐射的300种类动物.

    主要成果:

    • 非洲辐射的持续多样性与年龄相关,年轻的湖泊显示嵌套变异.
    • 新热带类动物的功能多样性低于最古老的非洲辐射,但探索了新的特征空间.
    • 进化速率与辐射年龄相反,表明早期特征的快速进化.

    结论:

    • 鱼的功能进化在各种辐射中遵循了类似的模式.
    • 进化中的偶然性导致了特定于血统的新奇事物,尽管存在广泛的相似之处.
    • 虽然早期的进化爆发得到了支持,但整体的特征多样性模式呈现的复杂性超出了简单的适应性辐射预期.