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相关概念视频

Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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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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Speciation Rates01:07

Speciation Rates

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Overview
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Life Histories01:29

Life Histories

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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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相关实验视频

Updated: May 9, 2025

Cone-Enriched Cultures from the Retina of Chicken Embryos to Study Rod to Cone Cellular Interactions
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灵长类形比率变化是否具有功能性和适应性?

Rachel A Munds1, Amanda D Melin1,2,3, James P Higham4

  • 1Department of Anthropology and Archaeology, University of Calgary, Canada.

American journal of primatology
|April 29, 2025
PubMed
概括

人类的色彩视觉在灵长类动物中是独一无二的,原因是长波 (L) 与中波 (M) 的比率较高,并且这种比率的变化很大. 这种形变化可能会影响人类对颜色的感知.

关键词:
颜色视觉 颜色视觉 颜色视觉 颜色视觉感知 感知 感知 感知感知变化 感知变化摄影受体的光学感应器视网膜形的形.

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科学领域:

  • 灵长类动物视觉系统的演变.
  • 动物的比较感知.
  • 视网膜形马赛克变化 视网膜形马赛克变化

背景情况:

  • 动物的感知变化为适应提供了洞察力.
  • 灵长类动物表现出显著的内部和内部特定视觉系统多样性.
  • (旧世界子,人猿,人类) 具有统一的三色,有短波 (S),中波 (M) 和长波 (L) 形.

研究的目的:

  • 探索灵长类类型的变化及其相对表达,重点关注L:M比.
  • 为了研究人类L:M形比率与其他形相比的独特特征.
  • 讨论L:M圆比差异对色彩感知的功能后果.

主要方法:

  • 对灵长类视网膜形马赛克的现有文献的综述.
  • 在卡塔林物种中对L:M圆比的比较分析.
  • 检查L:M比率变化对功能影响的证据.

主要成果:

  • 白内障通常表现出L和M圆敏感度的一致性,平均L:M比为1:1.
  • 人类表现出一个明显的平均L:M比率为2:1.
  • 人类在L:M比率 (75倍范围) 中表现出显著的物种内部变化.

结论:

  • 较高的平均L:M形比率和人类的巨大内部特异性变化可能会影响色彩感知.
  • 人类的色彩视觉在形比率上与其他形相显著不同.
  • 需要进一步的研究来理解这些差异的进化基础和感知后果.