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関連する概念動画

Trihybrid Crosses02:27

Trihybrid Crosses

25.0K
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
25.0K
Frequency-dependent Selection01:21

Frequency-dependent Selection

22.9K
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.
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Dihybrid Crosses01:18

Dihybrid Crosses

80.4K
Overview
80.4K
Monohybrid Crosses01:20

Monohybrid Crosses

238.3K
Overview
238.3K
Formation of Species01:31

Formation of Species

44.3K
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.
44.3K
Incomplete Dominance01:43

Incomplete Dominance

29.4K
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
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大規模なハプロタイプは,日の生態型差異の基礎となっている.

Marco Todesco1,2, Gregory L Owens1,2,3, Natalia Bercovich4,5

  • 1Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada.

Nature
|July 10, 2020
PubMed
まとめ

大規模で再結合しないハプロタイプブロックは,野生の紫陽花に適応性のあるアレルを維持し,生態型の差異化を促進します. この生態型適応の過程において,構造的な変化が重要な役割を果たします.

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Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
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Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea

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Laser-assisted Microdissection LAM as a Tool for Transcriptional Profiling of Individual Cell Types
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Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
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科学分野:

  • 進化生物学
  • 遺伝学
  • エコロジー

背景:

  • 種はしばしば多様な環境に適応した生態型を含みます.
  • 生態型形成と維持のメカニズムは,特にハイブリッド化では,まだ十分に理解されていません.

研究 の 目的:

  • 野生の紫陽花における生態型差異の遺伝的基礎を調査する.
  • 異なる環境で適応特性を維持するゲノム領域とメカニズムを特定する.

主な方法:

  • 3種 (Helianthus annuus,H. petiolaris,H. argophyllus) の1506種の野生の紫陽花を再配列した.
  • 大規模で再結合しないハプロタイプブロックの特定と分析
  • 生態学的特徴と環境要因とのハプロタイプブロックの関連分析

主要な成果:

  • 生態学的特徴と環境条件に関連した37の大きな (1-100 Mbp) 非再結合ハプロタイプブロックを発見した.
  • これらのブロックは適応性のあるアレルを維持し,日の生態型を区別し,開花時間や種子サイズなどの特性に重要な影響を及ぼします.
  • ハプロタイプブロックは高度に異なっており,構造的変異と関連しており,関連種の内向性を表す可能性があります.

結論:

  • 特定のハプロタイプブロック内の限られた再結合は,適応性のあるアレル組合せを維持し,エコタイプの分岐を促すのに不可欠です.
  • 構造的多様性は,野生の紫陽花の生態型適応に大きく寄与する.