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関連する概念動画

Variation01:19

Variation

An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
When independent and dependent variables are plotted on a scatter plot, the slope of a line is a value that describes the rate of change between the two...
Eukaryotic Evolution01:24

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Convergent Evolution01:54

Convergent Evolution

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.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
What is Variation?01:14

What is Variation?

Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
The range, standard deviation, standard error, and variance are the different measures of variation.
Range: The range is the difference between its maximum and...
Genetic Variation01:25

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...
Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...

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関連する実験動画

Updated: Jul 7, 2026

In Situ Hybridization Techniques for Paraffin-Embedded Adult Coral Samples
07:24

In Situ Hybridization Techniques for Paraffin-Embedded Adult Coral Samples

Published on: August 31, 2018

エボ・デボ:先祖のテーマのバリエーション

E M De Robertis1

  • 1Howard Hughes Medical Institute and Department of Biological Chemistry, University of California, Los Angeles, CA 90095-1662, USA. ederobertis@mednet.ucla.edu

Cell
|February 5, 2008
PubMed
まとめ
この要約は機械生成です。

ほとんどの動物は共通の祖先,ウルビラテリア (Urbilateria) を共有し,確立されたボディプラン遺伝子を持っています. 進化には,様々な動物群の遺伝子の損失が大きくなり,発達遺伝学と身体プランの多様性に影響を与えました.

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

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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

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関連する実験動画

Last Updated: Jul 7, 2026

In Situ Hybridization Techniques for Paraffin-Embedded Adult Coral Samples
07:24

In Situ Hybridization Techniques for Paraffin-Embedded Adult Coral Samples

Published on: August 31, 2018

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

In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
10:09

In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

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科学分野:

  • 進化的発達生物学 進化的発達生物学
  • 比較ゲノミクスとは
  • 動物の進化 動物の進化

背景:

  • ほとんどの動物は,共通の祖先であるUrbilateriaに由来しています.
  • ウルビラテリアは,ボディプランの開発のための基本的な遺伝ネットワークを所有していた.
  • 比較ゲノミクスは,進化の過程で動物系全体に相当な遺伝子喪失が起きていることを明らかにしています.

研究 の 目的:

  • ウルビラテリアの祖先の発達遺伝的ツールキットを再構築する.
  • 動物の体プランの進化における遺伝子喪失の役割を理解する.
  • 発達上の制約が進化の軌道を左右する影響を調査する.

主な方法:

  • 動物群の比較ゲノム分析.
  • 祖先の遺伝子コンテンツの系統遺伝的再構築.
  • 発達の遺伝子ネットワークのバイオ情報分析.

主要な成果:

  • 双子の祖先における保存された遺伝子と失われた遺伝子の識別.
  • ウルビラテリアン遺伝子のレパートリーから広範な遺伝子喪失の証拠.
  • 遺伝子喪失と動物のボディプランの多様化との相関.

結論:

  • 遺伝子の喪失は,動物の進化を形作る重要な要因である.
  • 発達上の制約は,動物の体プランの進化の経路に影響を与えた.
  • ウルビラテリアのツールキットの再構築は,動物の起源を理解するために不可欠です.