Stone Mason mentions the crabs (and their evolutionary example) in Episode #25 at 26:11. However as an FYI, that part of the conversation begins about a second earlier at 25:41.

Oh, and in the case that you need it, Punnett Square details aren't discussed until episode #29.

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--Gmork (MP, CA, WC, TG, MoGC, AAGC, PWTG, TBG)

your toasty awesomeness Wiki Czar! :)

"Chief informationless officer of the office of knows nothing" Any questions? :)

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I'm a Pusher. Won't you be a Pusher too?

...they happen to the best of us. 

<kidding>Oh and in case this wasn't a mistake, please visit the Crack Hits thread in the future</kidding>

And, of course, lastly.....+5 for me >:^)
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--Gmork (MP, CA, WC, TG, MoGC, AAGC, PWTG, TBG)

Right or not, you still put a big smile on my face! Heheee

"Chief informationless officer of the office of knows nothing" Any questions? :)

saviour!!!!!!!!  Damn, and I met the girl in person!!!!!  Didn't see any of those arrows though!

"Whatever you can do, or dream you can, begin it.  Boldness has genius, power and magic in it." - Goethe

You can toast this marshmallow anyday!                     

"Official Mascot of GirlCo"

It took me for freaking ever to see that this reply happened, thanks a ton by the way. I'm trying to get friends into Siglerism, and I wanted a particularly juicy example of his science. And the Punnet Squares were also on my list! So, extra credit.

No worries! With Nocturnal being published in dead tree form by Crown Publishing in April 2012, you'll get a chance to spread Siglerism through a hardcover version  

...And the wiki will probably need updating.. again!