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Types of Selection01:46

Types of Selection

46.5K
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...
46.5K
Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

765
The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
765
Frequency-dependent Selection01:21

Frequency-dependent Selection

24.5K
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.
24.5K
Mate Choice01:20

Mate Choice

12.0K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
12.0K
Limits to Natural Selection01:38

Limits to Natural Selection

36.1K
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.
36.1K
What is Natural Selection?01:32

What is Natural Selection?

133.2K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies
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Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies

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性選択は絶滅から保護する.

Alyson J Lumley1, Łukasz Michalczyk2, James J N Kitson1

  • 1School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK.

Nature
|May 19, 2015
PubMed
まとめ
この要約は機械生成です。

性選択は,有害な突然変異を排除し,遺伝的負荷を軽減するのに役立ちます. これは,特に近親交配のストレス下での生存と回復力を改善し,性繁殖の重要な利点を示しています.

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Assessing Differences in Sperm Competitive Ability in Drosophila
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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
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関連する実験動画

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Assessing Differences in Sperm Competitive Ability in Drosophila
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科学分野:

  • 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
  • 性選択性選択性選択について

背景:

  • 性生殖には費用がかかるが,成人の半数しか生殖をしない.
  • 性選択は,突然変異の負荷を浄化することによって,これらのコストを相殺する可能性があります.
  • 変異負荷,有害な変異の蓄積,適合性の限界.

研究 の 目的:

  • 性選択が突然変異の負荷を軽減し,集団の生存能力を高めるかどうかを実験的にテストする.
  • 強い性選択と弱い性選択が,突然変異の負荷を浄化する効果を比較する.

主な方法:

  • トリボリウム・カスタネウム (Tribolium castaneum) の複製集団は,異なる性選択の強さの下で6~7年間進化した.
  • 制御された近親交配 (シブ×シブ交配) による誘発性変異負荷.
  • 評価された集団の回復力および体格の低下は,近親交配の下で評価された.

主要な成果:

  • 以前の強い性選択を有する集団は,近親交配で絶滅に対する回復力を示した.
  • これらの血統は20世代以上にわたって内縁繁殖の適性を維持した.
  • 性選択が弱く/存在しない集団は,10世代以内に迅速な体力低下と絶滅を経験した.

結論:

  • 性選択は,小さな個々の効果を持つ変異でも,ゲノム全体の変異負荷を効果的に減らす.
  • この突然変異の負荷の減少は,集団の生存能力と遺伝的ストレスに対する耐性を著しく改善します.
  • 性選択は,性繁殖のコストを相殺する遺伝的利点を提供します.