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Mate Choice

Mate Choice

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.

Natural Selection and Mating Preferences

Natural Selection and Mating Preferences

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, inherently...

Inclusive Fitness

Inclusive Fitness

Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.

What is a Species?

What is a Species?

Frequency-dependent Selection

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.

Incomplete Dominance

Incomplete Dominance

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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関連する実験動画

Updated: May 29, 2026

Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes

Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes

Published on: May 7, 2021

内交は女性の乱交を助長する.

Łukasz Michalczyk¹, Anna L Millard, Oliver Y Martin

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

Science (New York, N.Y.)

|September 24, 2011

まとめ

複数のオスと交尾するポリアンドリアは,生殖能力を増やすことで雌に利益をもたらし,特に同胞交配が不適合な遺伝子による受精を危険にさらす場合です. この交配戦略は,遺伝的ボトルネックがこれらのリスクを高めるときに進化します.

科学分野:

進化生物学の進化生物学について
行動生態学は,行動生態学である.
集団遺伝学人口遺伝学

背景:

ポリアンドリー (複数の雄と交尾する雌) は一般的であるが,雌の潜在的なコストのために進化論的な疑問を提起する.
繁殖は1匹のオスで達成できるので,複数匹の交尾の利点は不明です.
近親交配は,遺伝的に相容れないハプロタイプによる受精のリスクを高め,潜在的に体調を低下させる可能性があります.

研究の目的:

インブリーディングの文脈で,女性のためのポリアンドリーのフィットネス上の利点を調査する.
特に遺伝的ボトルネックを経験している集団におけるポリアンドリーの進化的ドライバーを理解するために.

主な方法:

実験は,赤い粉虫であるトライボリウム・カスタネウムを用いて行われました.
集団は15世代に渡って近親交配と遺伝的ボトルネックに晒されていました.
女性の交尾行動 (性交) とフィットネスアウトカムが記録され,近親種と非近親種グループ間で比較されました.

主要な成果:

インブレッドの集団は,非インブレッドの対照群と比較して,女性の乱交のレベルが増加したことを示した.
この近親交配における乱交性の増加は,近親交配のうつ病を緩和するために多妻制を選択することを示唆しています.

さらに関連する動画

Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi

Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi

Published on: October 5, 2018

Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus

Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus

Published on: December 25, 2016

関連する実験動画

Last Updated: May 29, 2026

Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes

Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes

Published on: May 7, 2021

Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi

Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi

Published on: October 5, 2018

Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus

Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus

Published on: December 25, 2016

この発見は,ポリアンドリーと高親交の危険性のある条件下で女性の体格の向上を結びつけています.

結論:

ポリアンドリーは,近親交配による健康への負の影響を和らげる戦略として発展することができる.
遺伝的ボトルネックは,相容れないハプロタイプ受精に関連したリスクを悪化させ,雌のポリアンドラスな行動を好む.
この研究は,遺伝的ストレス下での集団の健康維持におけるポリアンドリーの適応的意義の証拠を提供します.