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Author Topic:   why is the lack of "fur" positive Progression for humans?
Blue Jay
Member (Idle past 2697 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


Message 198 of 202 (561914)
05-24-2010 10:49 AM
Reply to: Message 197 by Dr Jack
05-23-2010 4:34 AM


Paedomorphosis
Hi, Mr Jack.
Mr Jack writes:
In Neotony the changes usually result at the production end of the signals producing adult features and form, whereas paedomorphy results from alterations to the response to existing signalling. Neotony means that childlike features in one area are very likely to correlate with childlike features in another because they both have the same cause; paedomorphy doesn't share this feature.
Here's what I found from Encyclopedia Britannica:
quote:
paedomorphosis (in paedomorphosis (biology))
Retention by an organism of juvenile or even larval traits into later life. There are two aspects of paedomorphosis: acceleration of sexual maturation relative to the rest of development (progenesis) and retardation of bodily development with respect to the onset of reproductive activity (neoteny).
Some formatting changes made
Basically, I think it means paedomorphosis is the phenotypic result of either or both of the two concepts you described (increase in sexual development vs decrease in somatic development).

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

This message is a reply to:
 Message 197 by Dr Jack, posted 05-23-2010 4:34 AM Dr Jack has replied

Replies to this message:
 Message 199 by Dr Jack, posted 05-24-2010 10:56 AM Blue Jay has replied

  
Blue Jay
Member (Idle past 2697 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


Message 200 of 202 (561943)
05-24-2010 3:47 PM
Reply to: Message 199 by Dr Jack
05-24-2010 10:56 AM


Re: Paedomorphosis
Hi, Mr Jack.
Mr Jack writes:
Yeah, I wouldn't use the Encyclopedia Britannica as a source for biological terminology.
Encyclopedia Britannica is just the source I chose to cite because the definition was concise and straightforward. Their way of presenting it seems to be pretty pervasive, though.
For example, here is an online database associated with an evolutionary biology textbook from Blackwell Publishing.
Most of what I could find says that either neoteny is a type of paedomorphosis, or that paedomorphosis is a symptom of multiple genetic conditions, which are referred to as neoteny (slowing of somatic maturation) or progenesis (speeding up of sexual maturation).
I haven't seen anything like the production/receptor dichotomy you were talking about earlier, but I admittedly haven't put a lot of effort into it yet.
Anyway, I see the distinction you're making with your argument, and I'm really just quibbling the terminology here. It's no big deal.

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

This message is a reply to:
 Message 199 by Dr Jack, posted 05-24-2010 10:56 AM Dr Jack has not replied

  
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