现象亡和各种类型的自然选择
1Italian Society for Evolutionary Biology (ISEB), Asti, 14100, Italy. giacinto.libertini@yahoo.com.
Biochemistry. Biokhimiia
|March 10, 2024
概括
进化论超越了个人生存的范围. 自然选择包括亲属,群体和基因层面的相互作用,突出了复杂生物系统中的合作和相互依赖.
科学领域:
- 进化生物学 进化生物学
- 遗传学 遗传学 是一个
- 生态生态学 生态生态学
背景情况:
- 经典的达尔文选择侧重于个体的生存和繁殖.
- 这种个人级别的选择 (或经典的达尔文选择) 不足以解释诸如利他主义和自我牺牲 (亡) 这样的现象.
- 现有的进化模型无法充分解释各种生物相互作用和组织层面.
研究的目的:
- 扩大对自然选择的理解,超越个人层面.
- 整合多样化的进化机制,包括亲属选择,群体选择和共生相互作用.
- 根据更广泛的选择压力,重新评估生命,物种和个性等基本概念.
主要方法:
- 进化论的概念分析.
- 审查诸如亲属选择,群体选择和全息生物动态等现象.
- 检查进化过渡,包括内共生和多细胞性.
主要成果:
- 识别了超越个体的自然选择的多个层面,包括亲属,群体,基因和生态系统相互作用.
- 证明了像现象和eusociality这样的现象与更广泛的进化原理是一致的.
- 强调了物种在生态系统中的相互联系,以及合作在进化中的作用.
- 展示了像"生命"和"个人"这样的概念不是严格定义的,可以是任意的.
结论:
- 自然选择在多个相互关联的层面上运作,而不仅仅是在个体层面上.
- 合作和互动,即使以牺牲个人身份或生命为代价,也是重要的进化力量.
- 对进化的全面理解需要考虑个体,物种及其环境 (全息生物和生态系统) 之间的相互作用.
相关概念视频
Types of Selection
40.4K
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...
40.4K
What is Natural Selection?
115.2K
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.
115.2K
Limits to Natural Selection
31.3K
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.
31.3K
Frequency-dependent Selection
22.0K
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.
22.0K
Natural Selection and Mating Preferences
103
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,...
Females, due to their biological roles in conception, pregnancy, and nursing,...
103
Natural Selection and Adaptation
205
Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
Beyond physical adaptations,...
Beyond physical adaptations,...
205


