You-Read-It-Here-First Forum Index You-Read-It-Here-First
A collection of textual novelties
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
If you want to read the articles here, go ahead, just click on a forum and find a thread that interests need to register! If you want to post something... either new or in response to someone here, then click the Register link above. It's free... and it's fun to write your ideas here. You can even create a "blog" by starting a personal thread in the Daily Life Every Thread A Diary section...

Timing is Everything

Post new topic   Reply to topic    You-Read-It-Here-First Forum Index -> Science Hoop Shots
View previous topic :: View next topic  
Author Message

Joined: 20 Mar 2006
Posts: 1273
Location: Kent (East Hill), WA

PostPosted: Tue Aug 14, 2007 10:06 am    Post subject: Timing is Everything Reply with quote

This is fascinating news from followers of Evo-Devo (Evolutionary Developmental) Biology. As far the "hoop shot" here, what we might say is that there is less structural evolution than we think -- with creatures sharing a lot of the basic templates...however, the size and shape of those templates can vary a lot..kind of like a hardware store where there are screws in some basic formats, but you can get them in all sizes and you can put them together to be a house, a car, or a boat.

If humans and chimps are 99% alike genetically, how come we're so different? Scientists have been trying to answer that question for more than 30 years. Now researchers have come up with fresh evidence that the answer lies not in the proteins that genes produce but in the timing and level of gene activity.

In 1975, the late evolutionary biologist Allan Wilson of the University of California, Berkeley, and his then-grad student, Mary-Claire King, published a paper in Science relating that comparison of various proteins and nucleic acids between chimps and humans revealed hardly any differences between the two species. So they proposed that the obvious differences might result from the way genes are regulated. Some support for the assertion has since come from studies of individual genes, such as prodynorphin, an endorphin precursor that is expressed more in humans than other primates (ScienceNOW, 17 November 2005).


Of the genes whose promoter regions were most affected by selection in humans, many are involved in neural development, including such things as how the axons of nerve cells are directed to form connections with other nerve cells. Haygood says that's not surprising, given the vast differences in behavior and cognitive ability between chimps and humans. More exciting, in his opinion, is that perhaps more than 100 genes relate to carbohydrate metabolism, particularly glucose metabolism. Haygood says it's possible that shifting from the fruit-based chimp diet to one rich in carbs, in the form of roots and tubers, could have provided humans with the energy needed for brain expansion. The team reported its findings online 12 August in Nature Genetics.
Back to top
View user's profile Send private message Send e-mail
Visit the Instant Postcard Collection @
Looking for postcards of that favorite place? Family origins? Or that perfect vacation, except for the photos?
Researching your dissertation? Serious collector? Just looking for something neat?
You've found the right place to add to your existing collection, or to start a new one.
Display posts from previous:   
Post new topic   Reply to topic    You-Read-It-Here-First Forum Index -> Science Hoop Shots All times are GMT - 8 Hours
Page 1 of 1

Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001, 2005 phpBB Group