Transcript Natural Selection and CAs

Natural Selection and CAs
Bao-Hoi Nguyen
CS240 Spring 2003
Overview
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Introduction
Wolfram vs. Darwin
Optimal
The Leopard has an Internal CA
Evidence Against Natural Selection
Conclusion
Introduction
• Lots of complexity and diversity seen in
nature. Need an explanation
• Darwin: Origin of Species
• Wolfram: CAs
Wolfram vs. Darwin
• To many parts
• Interbreeding
• Finches
Optimal
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Definition
Some animals have advantages
Wolfram’s explanation
Why only human?
The Leopard has an Internal CA
• Animal
• SeaShells
• Plant
Animals
• Pattern looks complex
• Same patterns seen on all animals
• 2D CAs easily reproduce
Seashell
• Patterns
• Shapes
• 1D CA
Plants
• Leaf and tree shapes
• Fibonacci numbers
• Golden angle
Evidence Against Natural
Selection
• The neck of the giraffe
• The first cell
Conclusion
• Natural selection is questionable
• Wolfram’s theory is legitimate