Editing Developmental Biology and Evo-Devo (section)

== <span style="color: #FFFFFF;">Understanding</span> ==
Evo-Devo is understood through '''Regulation''' and '''Universality'''.

'''1. The "Architect" Genes (Hox)''':
"Building" the "Same Way."
* (See Article 637). A **Human** and a **Fruit Fly** look "Nothing Alike."
* However, they use **"Almost Identical"** genes to "Decide" "What is Front" and "What is Back."
* These are the **Hox Genes.**
* If you "Take a Hox Gene from a Mouse" and "Put it in a Fly," it **"Still Works."**
* "Life" uses a **"Universal Tool-Kit"** to "Build" its "Body."
* "Evolution" is "Re-arranging" the **"Furniture,"** not "Building a New House."

'''2. The "Switch" vs. the "Code" (Regulation)''':
"Small Changes" = "Big Shifts."
* (See Article 147). Most "Evolutionary Change" doesn't come from "New Genes."
* It comes from **"Changes in Regulation"** (The "Switches" that say 'When' and 'Where' a gene should turn on).
* A **Snake** has "Leg Genes," but the **"Switch"** that "Turns them On" has been **"Disabled"** during development.
* "Evo-Devo" is "The Art of the Switch."

'''3. The "Embryo" as a "Time Machine" (Phylogeny)''':
"History" in the "Womb."
* (See Article 637). Early "Embryos" of **Fish, Chicks, and Humans** look **"Identical."**
* They all have "Gill Slits" and "Tails."
* As they "Develop," they "Diverge."
* This is "Evidence" of our **"Common Ancestry."**
* "Development" is the **"Replay"** of "Evolutionary History" (with modifications).

'''The 'Eyeless' Gene (Pax6)'''': A "Groundbreaking" discovery. A "Single Gene" (**Pax6**) "Triggers" the "Development of Eyes" in "Every Animal" from "Squid" to "Human." It proved that "Complex Organs" "Originated" "Once" and have been "Modified" for "Billions of Years."
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