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関連する概念動画

Monohybrid Crosses01:20

Monohybrid Crosses

Overview
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...
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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
Law of Segregation01:49

Law of Segregation

When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...

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関連する実験動画

Updated: Jul 27, 2026

Microinjection of Western Corn Rootworm, Diabrotica virgifera virgifera, Embryos for Germline Transformation, or CRISPR/Cas9 Genome Editing
07:42

Microinjection of Western Corn Rootworm, Diabrotica virgifera virgifera, Embryos for Germline Transformation, or CRISPR/Cas9 Genome Editing

Published on: April 27, 2018

粉虫の母性効果の利己的な遺伝子は,粉虫の粉虫に含まれている.

R W Beeman1, K S Friesen, R E Denell

  • 1U.S. Grain Marketing Research Laboratory, U.S. Department of Agriculture, Manhattan, KS 66502.

Science (New York, N.Y.)
|April 3, 1992
PubMed
まとめ

新しく発見された,母性効果の致死性M因子のクラスは,小麦粉虫に多く見られる. これらの要因は,それらが欠けている子孫に致死性をもたらし,自身の遺伝性を確保することによって,集団に広がります.

科学分野:

  • 遺伝学 遺伝学とは
  • 進化生物学の進化生物学について
  • 人口遺伝学 人口遺伝学

背景:

  • 主要な母性の致死因は,集団遺伝学に影響を与える可能性があります.
  • 自然集団におけるそのような要因の流行とメカニズムは,完全に理解されていません.

研究 の 目的:

  • トリボリウム・カスタネウム (Tribolium castaneum) の新種の母親による致死因の発生と性質を調査する.

主な方法:

  • トリボリウム・カスタネウムとトリボリウム・コンフューサム (Tribolium confusum) の個体群を大陸から集めたフィールドコレクション.
  • M因子とその宿主染色体への統合を特定し,特徴付けるための遺伝分析.
  • M要因の自己選択と救済特性を評価する.

主要な成果:

  • 自然なトリボリウムカスタネウム集団で,支配的な,母性効果の致死性M因子の広範囲に広がり,以前は知られていなかったクラスが特定されました.
  • これらのM因子は宿主染色体に統合され,自己選択を示し,コピーのない子孫の致死性を引き起こします.
  • M要因は,追加の選択的利点なくとも,M以外の同位体よりも,Mを含む染色体を永続化させます.
  • 同じような要因は,関連種であるTribolium confusum.でも発見されました.

さらに関連する動画

Determining the Role of Maternally-Expressed Genes in Early Development with Maternal Crispants
10:08

Determining the Role of Maternally-Expressed Genes in Early Development with Maternal Crispants

Published on: December 21, 2021

Mass-Rearing and Molecular Studies in Tortricidae Pest Insects
06:22

Mass-Rearing and Molecular Studies in Tortricidae Pest Insects

Published on: March 25, 2022

関連する実験動画

Last Updated: Jul 27, 2026

Microinjection of Western Corn Rootworm, Diabrotica virgifera virgifera, Embryos for Germline Transformation, or CRISPR/Cas9 Genome Editing
07:42

Microinjection of Western Corn Rootworm, Diabrotica virgifera virgifera, Embryos for Germline Transformation, or CRISPR/Cas9 Genome Editing

Published on: April 27, 2018

Determining the Role of Maternally-Expressed Genes in Early Development with Maternal Crispants
10:08

Determining the Role of Maternally-Expressed Genes in Early Development with Maternal Crispants

Published on: December 21, 2021

Mass-Rearing and Molecular Studies in Tortricidae Pest Insects
06:22

Mass-Rearing and Molecular Studies in Tortricidae Pest Insects

Published on: March 25, 2022

結論:

  • 発見されたM因子は,その自己拡散を集団で推進する新しい遺伝的メカニズムを表しています.
  • これらの要因は,トライボリウム集団の遺伝的構造と進化に大きく影響を与えます.
  • この発見は,自然集団における急速な遺伝子変化と適応のための潜在的なメカニズムを示唆しています.