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関連する概念動画

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...
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.
What is Population Genetics?01:25

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

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.
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

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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Foraging Path-length Protocol for Drosophila melanogaster Larvae
07:26

Foraging Path-length Protocol for Drosophila melanogaster Larvae

Published on: April 23, 2016

単一の遺伝子に対する周波数依存の選択によって行動ポリモルフィズムを維持する.

Mark J Fitzpatrick1, Elah Feder, Locke Rowe

  • 1Department of Biology, University of Toronto at Mississauga, Mississauga, Ontario L5L 1C6, Canada.

Nature
|May 15, 2007
PubMed
まとめ
この要約は機械生成です。

負の周波数依存的選択は,フルーツフライの採食行動における遺伝的多様性を維持する. 採食遺伝子が駆動するこの進化的メカニズムは,栄養量が少ない条件下で最も顕著であり,その生態学的意義を強調しています.

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Last Updated: May 11, 2026

Foraging Path-length Protocol for Drosophila melanogaster Larvae
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科学分野:

  • 進化生物学の進化生物学について
  • 行動遺伝学 行動遺伝学
  • 人口遺伝学 人口遺伝学

背景:

  • 自然選択の下で遺伝的多様性の維持を理解することは,進化生物学における重要な課題である.
  • ネガティブ周波数依存選択は,遺伝的多形性を維持するための提案されたメカニズムですが,特に特定の遺伝子を現象型と結びつける経験的例は稀です.
  • フルーツフライの餌探しの遺伝子は,行動に影響するよく研究された自然のポリモルフィズムです.

研究 の 目的:

  • 自然の遺伝的多形性における周波数依存選択を実証する.
  • この周波数依存選択の遺伝的根拠を特定するために.
  • 周波数依存選択を媒介する環境条件,特に栄養分レベルが果たす役割を調査する.

主な方法:

  • フルーツフライの実験的な進化は,収穫遺伝子の異なるアレルを持つフルーツフライ (for(s) とfor(R)).
  • フィットネスアッセイは,さまざまな栄養条件 (低,高) で実施された.
  • 観察された周波数依存のフィットネスパターンにおける採食遺伝子の役割を確認するために変異性アレルの導入.

主要な成果:

  • 採食遺伝子の自然アレル (for (((s)) と for (((R)) の両方とも,栄養量が低い条件下でのマイナスの周波数依存選択を示し,希少なアレルはより高い適性を示しています.
  • この周波数依存の選択は,栄養量が高い条件下では消滅し,幼虫の競争の役割を示しています.
  • ローバーの背景にあるシッターのような変異性アレルは,自然シッターのアレルと同じような周波数依存のフィットネスを示し,採食遺伝子の関与を確認した.

結論:

  • この研究は,自然な遺伝的多形性における負の周波数依存選択の明確な実証を提供します.
  • 採食遺伝子は,この行動に影響する周波数依存の選択に責任を負う単一の,自然に多形遺伝子として識別されます.
  • 栄養素の利用可能性などの環境要因は,周波数依存選択の動作に大きく影響する.