Difference between revisions of "Eyespot"
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Revision as of 02:50, July 15, 2007
A light-sensitive region in certain protozoa,[1] such as Euglena.
D. E. Nilsson and S. Pelger [2] used computer modeling of the evolution of eyes to find out if it was possible for there to be a smooth gradient of change from a pigmented eye spot to an eye with a lens and cornea, and how long such a transformation would take. They used highly conservative figures for the possible change in each generation. Many human traits are over 50% heritable, and they gave their model a lower figure. They also chose very conservative values for the amount of possible variation in a population. Using these figures, they calculated that through the mechanism of evolution an eyespot could evolve into an eye with a lens and a cornea in less than a half a million years.
This mechanism is contested by Young Earth Creationists, who contend that the Earth was created less than 10,000 years ago, and that in that context such a piece of evolutionary development would not be possible.
References
http://www.youtube.com/watch?v=furcepFlfZ4 <-A short video explaining the possible evolution of the eye.