Why do chickens have teeth in their DNA but not their mouths?
In short: Explore the field of evolutionary developmental biology (Evo-Devo) to understand why some animals retain ancestral traits in their genetic blueprint while losing them in their physical form.
The video introduces Evo-Devo, a field that analyzes the developmental processes of different organisms to map ancestral relationships and evolutionary history. By studying how organisms grow, scientists can uncover how specific biological traits evolved over time.
A key example of this is the presence of teeth in chickens. While modern chickens do not have teeth, the genetic instructions for them remain in their developmental regulatory genes. This demonstrates how evolution can modify the expression of genes—such as Homeobox (HOX) genes—to change an organism's physical appearance without deleting the underlying genetic code.
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Sources
- Summary by Intellect · source: Evolutionary Development: Chicken Teeth - Crash Course Biology #17
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