The Evolution of the Eye (C0nc0rdance)
Channel: CraniumOnEmpty
Date: 2012-02-27

3 videos by C0nc0rdance:

- The Evolution of the Eye: A Molecular Perspective http://youtu.be/cnQGUQvtaPg
This is a highly detailed molecular level view of the three components of the modern vertebrate eye:
1. Opsins (light sensing)
2. Developmental transcription factors (turn genes on and off at the right times)
3. Signal transduction (taking signals from membrane receptors to effector pathways)

All of these are highly conserved, line up with evolutionary divergences, and show predictable patterns with regards to importance in the basic visual unit.
Most figures are from the publicly available paper by Detlev Arendt, in International Journal of Developmental Biology, Vol 47: p 563-571.
You can find it at PubMed, http://www.ncbi.nlm.nih.gov/
Categoria:

- The Evolution of the Eye: The Lens http://youtu.be/QXbqok3DXnQ
A technical examination of the evolution of the lens.

What makes the lens of the vertebrate eye unique, where does the information come from to make a lens, and how could a lens be the result of evolution, rather than design.
Categoria: Educação

- The Evolution of the Eye: Lachrymal Glands http://youtu.be/94-QG4QEIe4

A brief look at some of the evidence for the evolution of the lachrymal gland, and a plausible scenario by which it might have evolved.