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Here's why you aren't built like a lobster.
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Our bodies are mirror images of lobsters and other arthropods from back to belly. We've know since the early 19th century that our guts and nervous systems are inverted from theirs, but only recently has molecular biology shown us why. Here's the evolutionary tale about a worm doing the backstroke and why your guts are on your front.
This is part 2 of 3 in my series about how our bodies evolved to look like they do. Check out the others:
Part 1 - https://www.youtube.com/watch?v=qdNE4WygyAk
Part 3 - Coming Friday!
Dorsoventral inversion: http://en.wikipedia.org/wiki/Inversion_(evolutionary_biology)
Geoffrey Saint-Hilaire: http://en.wikipedia.org/wiki/%C3%89tienne_Geoffroy_Saint-Hilaire
Common animal body plan between protostomes and deuterostomes: http://www.hhmi.ucla.edu/derobertis/EDR_MS/Evo-Devo_page/EVO-DEVO.html
How we know that our body plan came later: http://scienceblogs.com/pharyngula/2006/01/12/hemichordate-evodevo/
Step by step along the evolutionary tree:
http://en.wikipedia.org/wiki/GnathostomataEvolutionary timeline of vertebrates: http://www.utexas.edu/news/2008/03/03/tree/
Have an idea for an episode or an amazing science question you want answered? Leave a comment below!
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Joe Hanson - Host and writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen Inc.
Kate Eads - Associate Producer
Katie Graham - Director of Photography
Andrew Matthews - Editor and motion graphics
John Knudsen - Gaffer
"Ouroboros" by Kevin MacLeod
Stock images via Shutterstock
Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios
Last week's video: Why Did We Blow on NES Games? https://www.youtube.com/watch?v=4Gf9mtXnJfM
The Science of BBQ https://www.youtube.com/watch?v=ccqOVmsybO4
The Science of Game of Thrones - https://www.youtube.com/watch?v=Utu-LpJn3Is
The Far Future of the Universe - https://www.youtube.com/watch?v=Jl9DwNOonOA
There Was No First Human - https://www.youtube.com/watch?v=xdWLhXi24Mo
How The Elements Got Their Names - https://www.youtube.com/watch?v=mtg9p6A6xnY