Cape Cod Institute
 
Behavior OnLine Forums  
The gathering place for Mental Health and
Applied Behavior Science Professionals.
 
Become a charter member of Behavior OnLine.

Go Back   Behavior OnLine Forums > BOL Forums > Evolutionary Psychology

Notices

Reply
Thread Tools Display Modes
  #1  
Unread September 11th, 2006, 03:45 PM
ToddStark ToddStark is offline
Member
 
Join Date: Jul 2004
Posts: 174
Lightbulb Old speciation theory given new life

Theodosius Dobzhansky's 70 year old theory that speciation could sometimes be kicked off by relocating genes (rather than by the more common gradual accumulation of mutations) has resurfaced thanks to recent genetics research by J.P. Masly at the University of Rochester.

Quote:
Dobzhansky had studied fruit flies in the infant days of genetic research in 1930. He mapped out how it might be possible for sections of chromosomes to relocate themselves in a genome. Those mobile sections can cause sterility in inter-species hybrids, which can act as a speciation pressure. Masly found a way to test the theory, also involving fruit flies.

In theory, the idea was sound, but scientists long debated whether it actually happened in nature. Eventually a competing theory involving the gradual accumulation of mutations was shown to occur in nature so often that geneticists largely dismissed the moving gene hypothesis.
Quote:
The finding, reported in today's issue of Science, reveals that scientists must reassess the processes involved in the origin of species. The beginnings of speciation, suggests the paper, can be triggered by genes that change their locations in a genome.
Source: Science Daily summary of the Science article
Reply With Quote
  #2  
Unread September 12th, 2006, 03:06 PM
James Brody James Brody is offline
Forum Leader
 
Join Date: Jun 2004
Location: Philadelphia area
Posts: 1,143
Default Re: Old speciation theory given new life

No great surprise!

Every so often I trip across speculation that we sometimes catch genes and modifications from viruses...

And Svante recently? announced that some of you and me was borrowed from gorillas!

JB
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 01:33 AM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright © 1995-2004 Behavior OnLine, Inc. All rights reserved.