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A Practical Guide to Phylogenetics for Nonexperts
Published on: February 5, 2014
ホモプラシー:パターンの検出から,進化のプロセスとメカニズムの決定まで
David B Wake1, Marvalee H Wake, Chelsea D Specht
1Museum of Vertebrate Zoology, University of California, Berkeley, CA 94720, USA. davidbwake@gmail.com
まとめ
進化生物学は,特徴が時間とともにどのように変化するかを研究しています. 関係のない種における類似の特徴の研究は,進化の新しさと適応の基礎となる遺伝的および発達的経路を明らかにする.
科学分野:
- 進化生物学の進化生物学について
- 発達生物学 発達生物学について
- 遺伝学 遺伝学とは
背景:
- 進化生物学の核となる概念は,変異による子孫によるフェノタイプの多様化である.
- 関係のない分類体における類似の現象型は,伝統的な進化論モデルに異議を唱える.
- ホモプラシー (類似性は独立して進化した) は,特性の進化についての洞察を提供します.
研究 の 目的:
- 関連のない分類種における類似の現象型の進化を牽引する遺伝的および発達的メカニズムを調査する.
- ホモロジー,収束,並列進化,逆転が現象相似性にどのように貢献するか探求する.
- 形態学的特徴の起源を理解するために,新しい系統遺伝学および分子技術を活用する.
主な方法:
- 進化的関係を確立するための系統遺伝分析.
- 遺伝的基盤を特定するための分子およびゲノム技術.
- 発達生物学は,特性の形成を研究するためのアプローチである.
- ホモプラシーを示す多様な分類種の比較分析.
主要な成果:
- 同様の現象型が異なる進化の系統で独立して発生する事例を特定した.
- ホモプラシーに寄与する潜在的に共有された遺伝的または発達的経路を発見.
- 特徴の進化を研究する際に統合された系統遺伝学および分子データの有用性を実証した.
結論:
- ホモプラシーは,形態学的進化の基本的メカニズムを発見するための重要な機会を提供します.
- 遺伝的および発達的要素の再配置は,収束的な現象型につながる可能性があります.
- 先進的なテクニックは,進化の類似性がどのように発生するかをより深く理解することを促進します.
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Gene Families
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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