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相关概念视频

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...

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相关实验视频

Updated: Jul 12, 2026

Determining the Egg Fertilization Rate of Bemisia tabaci Using a Cytogenetic Technique
05:24

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昆虫的繁殖能力和生育能力:化学诱导的下降

D S Grosch

    Science (New York, N.Y.)
    |August 23, 1963
    PubMed
    概括

    摄入化物会降低虫黄蜂的卵产量,但不会影响卵子的活力. 这表明石对参与营养同化和利用的体组织产生影响,而不是对子细胞的发育.

    科学领域:

    • 毒理学 毒理学 毒理学
    • 昆虫生理学 昆虫生理学
    • 生殖生物学 生殖生物学

    背景情况:

    • 黄蜂在化时拥有成熟的卵巢,这使得它们成为研究生殖影响的模型.
    • 石是一种已知的有毒物质,可能对各种生物过程产生影响.

    研究的目的:

    • 为了研究食用矿对甲虫黄蜂繁殖能力的影响.
    • 为了确定矿是否会影响卵产量,化率或潜在的生理机制.

    主要方法:

    • 在Braconid黄蜂身上,它们被注射了化物.
    • 对卵产量和化率进行了监测.
    • 评估了与营养同化相关的对体组织的影响.

    主要成果:

    • 化物摄入导致整体蛋产量非选择性下降.
    • 化蛋的百分比没有受到影响.
    • 身体组织对食物同化和利用的有效性发生了变化.

    结论:

    • 甲酸暴露在形黄蜂中主要影响与卵生产相关的体功能,而不是直接影响性质组活力.
    • 这项研究强调了昆虫生殖生理学对有毒物质暴露的敏感性.

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