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相关概念视频

Types of Selection01:46

Types of Selection

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...

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相关实验视频

Updated: Jun 20, 2026

The Vermicelli and Capellini Handling Tests: Simple quantitative measures of dexterous forepaw function in rats and mice
09:37

The Vermicelli and Capellini Handling Tests: Simple quantitative measures of dexterous forepaw function in rats and mice

Published on: July 22, 2010

操纵饮食对brachyuran爪的大小和性能的影响

L D Smith, A R Palmer

    Science (New York, N.Y.)
    |April 29, 1994
    PubMed
    概括

    在没有贝的猎物上发展出更大,更强大的爪子. 使用诱导的不对称性和潜在的遗传性表明类的爪子大小和二形态的进化途径.

    科学领域:

    • 海洋生物学 海洋生物学
    • 甲动物研究研究
    • 进化生物学是进化的生物学.

    背景情况:

    • 爪的大小和强度对于生存和繁殖至关重要.
    • 环境因素和猎物类型可以影响形态.
    • 无脊椎动物的骨适应不同于脊椎动物,原因是变周期.

    研究的目的:

    • 研究猎物类型对爪发育的影响.
    • 检查爪子固定如何影响爪子不对称.
    • 探索适应性表型可塑性的潜力,以推动爪的进化变化.

    主要方法:

    • 实验性养的食有的猎物与没有的猎物.
    • 它使实验对象的一根爪子停滞不前.
    • 测量和比较爪子的大小,强度和不对称性.

    主要成果:

    • 与那些食没有的猎物相比,食的猎物表现出更大,更强大的爪子.
    • 爪子的固定导致了爪子大小和强度的不对称.
    • 观察到的变化凸显了环境刺激和使用在塑造形态中的作用.

    结论:

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    Published on: July 22, 2010

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  • 饮食和爪子的使用显著影响爪的发育和形态.
  • 短期的适应性反应,如果是遗传的,可以导致长期的进化变化.
  • 爪二形可能通过环境适应和行为手性结合而演变.