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相关概念视频

Types of Selection01:46

Types of Selection

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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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Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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Speciation Rates01:07

Speciation Rates

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Overview
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What is Natural Selection?01:32

What is Natural Selection?

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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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Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Mate Choice01:20

Mate Choice

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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.
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相关实验视频

Updated: May 24, 2025

Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments
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在色彩中的环境梯度.

Lekshmi B Sreelatha1,2,3, Pedro Tarroso1,2,3, Ossi Nokelainen4,5

  • 1CIBIO-InBIO Associate Laboratory, Research Centre in Biodiversity and Genetic Resources University of Porto Vairão Portugal.

Ecology and evolution
|March 3, 2025
PubMed
概括

动物的颜色适应环境压力. 对于卢西塔尼亚壁来说,湿度影响背部亮度,而较冷的气候与较大,较暗的动物相关,支持格洛格和伯格曼的假设.

关键词:
亮度 亮度 亮度 亮度背部的颜色变色 背部的颜色变色生态地理规则 生态地理规则子 子 子黑色化发生在黑色化过程中.热性黑色素质热性黑色素质

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Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards
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Last Updated: May 24, 2025

Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments
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Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards
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科学领域:

  • 生态生态学 生态生态学
  • 进化生物学 进化生物学
  • 类学 类学 类学 类学

背景情况:

  • 环境压力显著影响动物的颜色,推动动物适应当地条件.
  • 气候梯度对物种在分布范围内的颜色变异的确切影响尚未完全理解.
  • 了解这些关系对于预测物种对环境变化的反应至关重要.

研究的目的:

  • 为了调查路西塔尼亚壁 (Podarcis lusitanicus) 的背部颜色的空间变化,以应对环境梯度.
  • 测试有关气候对着色的影响的假设,包括Gloger的,热色,光保护和Bergmann的假设.
  • 阐明直接和间接的途径 (通过身体质量介导),将环境变量与颜色联系起来.

主要方法:

  • 多光谱摄影被用来量化来自21个地点的463只卢西塔尼亚壁的背部颜色亮度 (亮度).
  • 采用零碎结构方程建模来分析环境变量与的轻度之间的关系,考虑到身体质量.
  • 来自Gloger的预测,热色,光保护和Bergmann的假设同时进行了测试.

主要成果:

  • 的轻度与湿度有显著的相关性,支持格洛格的假设,但不是与太阳辐射强度 (光保护假设).
  • 温度和轻度 (热色) 之间没有发现直接关系,但通过身体尺寸检测到间接影响.
  • 寒冷地区的体积更大,背部颜色更深,符合伯格曼的假设.

结论:

  • 气候因素,特别是湿度和温度 (间接通过体型),是卢西塔尼亚壁背部颜色演变的关键驱动因素.
  • 这些发现突出了环境压力和进化适应在塑造动物颜色的复杂相互作用.
  • 需要进一步的实验研究来确认不同环境中气候驱动的颜色变化背后的因果机制.