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関連する概念動画

Frequency-dependent Selection01:21

Frequency-dependent Selection

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.Positive Frequency-Dependent SelectionIn positive...
Understanding Species and Reproductive Barriers01:17

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Types of Selection01:46

Types of Selection

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...
Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Limits to Natural Selection01:38

Limits to Natural Selection

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.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...

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関連する実験動画

Updated: Jun 7, 2026

Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
07:12

Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses

Published on: June 30, 2023

種の選択は,自己不適合性を維持する.

Emma E Goldberg1, Joshua R Kohn, Russell Lande

  • 1Department of Biological Sciences, University of Illinois at Chicago, 840 West Taylor Street, M/C 067, Chicago, IL 60607, USA.

Science (New York, N.Y.)
|October 23, 2010
PubMed
まとめ
この要約は機械生成です。

異種交配を促進する特質である自己不適合性は,ソラナセア (ナイトシェード) 家族の種多様化率を大幅に高めています. この進化上の利点は,自己受精の短期的な利点を相殺し,強制的なアウトクロス化を好む.

さらに関連する動画

Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses
08:08

Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses

Published on: June 16, 2020

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
05:39

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

Published on: December 2, 2022

関連する実験動画

Last Updated: Jun 7, 2026

Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
07:12

Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses

Published on: June 30, 2023

Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses
08:08

Determination of Self- and Inter-(in)compatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses

Published on: June 16, 2020

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
05:39

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

Published on: December 2, 2022

科学分野:

  • 進化生物学の進化生物学について
  • 植物仕様プラント仕様
  • 生殖生物学 生殖生物学

背景:

  • 種多様性を促す要因を理解することは,進化生物学における重要な目標である.
  • 種化と絶滅率に影響を与える特性は,特に頻繁に移行する場合は,検出が困難です.
  • ヘルマフロディテの異種交配を強制する自己不適合性は,開花植物ではしばしば失われ,自己受精を容易にする.

研究 の 目的:

  • ソラーナセアファミリー内の多様化率に対する自己不適合性の影響を調査する.
  • 自己不適合性の喪失が種多様性に影響するかどうかを判断する.
  • 自己受精の長期的進化的結果と,強制的な異種交配の長期的進化的結果を評価する.

主な方法:

  • ソラーナセイ種の多様化率の比較分析.
  • 自己不互換性の進化を追跡するための系統遺伝的再構築.
  • 生殖戦略と種種化,絶滅率を相関させる統計モデリング.

主要な成果:

  • 機能的自己不適合性を示すSolanaceaeファミリーの種は,著しく高い割合で多様化します.
  • 自己不適合性の喪失は,自己受精につながりますが,長期的な多様化利点は与えられません.
  • 種の選択は,長期的には自己受精よりも強制的な異種交配を強く好む.

結論:

  • 機能的自己不互換性は,Solanaceaeにおいてより高い種の発生率を促進する重要な特徴である.
  • 進化の軌道は,自己受精の潜在的な短期的な利益にもかかわらず,アウトクロッシング戦略を好む.
  • 生殖系は生物多様性のマクロ進化パターンを形成する上で重要な役割を果たします.