532: Unrestrained Retina Too Much Of A Good Thing
"Normally Pax6 is turned off in the ventral optic stalk to allow the optic nerve to develop," said Kim. "It's an incredibly efficient way to control development because you don't need a completely new pathway for a new structure."
"Pax 6 is a powerful and ancient gene for eye determination," noted Lemke. "It plays this role from fruit flies to humans. As a consequence, its expression must be highly regulated during development." Although the retina is obviously required for sight, Lemke points out that "it's possible to have too much of a good thing."
An ID advocate thinks that this research has no relevance to evolution.
Common descent is huge here. And adapting an existing structure is what evolution does.
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