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Related Concept Videos

Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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4-Dimensional Imaging of Zebrafish Optic Cup Morphogenesis
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Chance and necessity in eye evolution.

Walter J Gehring1

  • 1Department of Growth and Development, Biozentrum University of Basel, Switzerland. walter.gehring@unibas.ch

Genome Biology and Evolution
|October 8, 2011
PubMed
Summary
This summary is machine-generated.

Recent discoveries in eye evolution support Darwin's theory of random variation and natural selection. The complex gene regulatory networks involved highlight the inherent unpredictability of evolutionary processes, particularly in the development of diverse eye types.

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Area of Science:

  • Evolutionary Biology
  • Developmental Biology
  • Genetics

Background:

  • Charles Darwin proposed evolution via random variation and natural selection.
  • Jacques Monod highlighted the inherent unpredictability of biological systems.
  • Eye evolution research provides insights into evolutionary mechanisms.

Purpose of the Study:

  • To examine recent discoveries in eye evolution.
  • To assess the agreement of these discoveries with Darwin's and Monod's theses.
  • To discuss the evolution of gene regulatory networks, specifically the Hox gene cluster.

Main Methods:

  • Comparative analysis of eye evolution across species.
  • Review of genetic and developmental data related to eye morphology.
  • Exploration of gene regulatory network evolution, including Hox genes.

Main Results:

  • Recent findings support Darwin's concept of a simple eye prototype.
  • Evidence suggests a monophyletic origin for diverse eye types.
  • The complexity of gene regulatory networks underscores evolutionary unpredictability.

Conclusions:

  • Eye evolution aligns with Darwinian principles and Monod's concept of unpredictability.
  • The evolution of Hox genes and body plan specification demonstrates gradual diversification from prototypes.
  • Understanding gene regulatory networks is crucial for comprehending evolutionary trajectories.