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関連する概念動画

Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

197
Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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Limits to Natural Selection01:38

Limits to Natural Selection

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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.
30.0K
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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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.
In contrast, regions which code...
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

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Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
62.3K
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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関連する実験動画

Updated: Apr 26, 2026

Solid Plate-based Dietary Restriction in Caenorhabditis elegans
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Solid Plate-based Dietary Restriction in Caenorhabditis elegans

Published on: May 28, 2011

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カロリー制限 à Lamarckckck

Eugene V Koonin1

  • 1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA.

Cell
|July 19, 2014
PubMed
まとめ

以前に外来的な小干渉 (si) RNAで見られた表遺伝子遺伝は,飢餓によって誘発された遺伝子静止のために現在示されています. この得られた特徴は,第3世代まで長寿を延ばし,ラマルコの遺伝が重要な進化的メカニズムであることを示唆しています.

科学分野:

  • エピジェネティクス エピジェネティクス
  • 進化生物学の進化生物学について
  • 分子生物学は分子生物学である.

背景:

  • 小型の干渉性 (si) RNAによる表遺伝子遺伝は,動物モデルで記録されています.
  • 習得した特徴は,通常,遺伝によって子孫に受け継がれることはありません.

研究 の 目的:

  • 既得の表遺伝的変化の遺伝を調査する.
  • 環境が誘発した遺伝子サイレンシングが世代を超えて受け継がれるかどうかを判断する.

主な方法:

  • 動物モデルにおける飢餓による遺伝子サイレンシングを誘導する.
  • 遺伝子発現パターンの分析と,複数の世代にわたる表遺伝的修正.
  • 内生性小干渉RNA (siRNA) を遺伝媒介体として利用する.

主要な成果:

  • 飢餓に誘発された遺伝子サイレンスパターンの遺伝が実証された.
  • 3代目の子孫の長寿が増加することが観察されました.
  • 既得のエピジェネティック情報を伝達する際の内生性siRNAの役割を示した.

結論:

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Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans
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Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans

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関連する実験動画

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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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Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans
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Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans

Published on: August 16, 2017

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  • 飢餓のような環境要因によって引き起こされるものを含む,既得の特徴の表遺伝子遺伝は可能である.
  • 既得の特徴のラマーキアン型遺伝は,重要な進化的現象であることを示唆しています.
  • 世代を超えたエピジェネティック継承を媒介する内生性siRNAの役割を強調しています.