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Author Topic:   "Best" evidence for evolution.
Sarawak
Member (Idle past 4713 days)
Posts: 47
Joined: 03-07-2009


Message 66 of 830 (503311)
03-17-2009 5:19 PM


Plants
I think plants offer some of the easiest to understand and experimentally reproducible evolution work. A good book to start with is Karl Niklas' The Evolutionary Biology of Plants. Botanists estimate that 20-40% of existing plant species have arisen through a process of hybridization, a process not normally available to animals (but who knows?). That is an astounding number and several plant species have been experimentally derived from known wild plants through a plant hybridization process and the produced species are identical to known wild species. The rapid life cycles of plants compared to animals is a big advantage.

Our green friends often get ignored.


Replies to this message:
 Message 67 by Taq, posted 03-17-2009 5:55 PM Sarawak has replied

  
Sarawak
Member (Idle past 4713 days)
Posts: 47
Joined: 03-07-2009


Message 68 of 830 (503315)
03-17-2009 6:33 PM
Reply to: Message 67 by Taq
03-17-2009 5:55 PM


Corn/Teosinte
Taq:

Ah, yes corn. I spent hours discussing corn with George Beadle. Late in life he hit the lecture circuit with something like "The Mystery of Maize". It was pretty good.

Did you have an opportunity to hear that?

I was thinking sunflowers. It's in Niklas' book.

Edited by Sarawak, : an oops!


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 Message 67 by Taq, posted 03-17-2009 5:55 PM Taq has taken no action

  
Sarawak
Member (Idle past 4713 days)
Posts: 47
Joined: 03-07-2009


Message 72 of 830 (503377)
03-18-2009 11:15 AM


More Plants
Here's a shortened paragraph (p64, Niklas' Evolutionary Biology of Plants)

"One of the most stunning "laboratory" investigations of speciation is that of Loren Rieseberg and his coworkers, who reproduced the genetic changes leading to the formation of a naturally occurring species of sunflower (Helianthus anomalus)......Under laboratory conditions these changes are repeatable across independent experiments....The two putative ancestral species of H. anomalus are H. annuus and H. petiolaris. All three species are self incompatible annuals....hybridized H. annuus and H. pertiolaris to produce three independent hybrid lines that were subjected to different sib mating and back crossing regimes......lines converged to nearly identical gene combinations including parallel changes in the nonrearranged portions of chromosomes.....the path of evolutionary change was repeatable in ways suggesting that selection rather than chance governs the genetic composition..."

Sorry about hacking the paragraph so much, but there are copyright concerns. If you have access to Science, here's a reference:

Science 28 November 2003:
Vol. 302. no. 5650, p. 1499
DOI: 10.1126/science.302.5650.1499

Edited by Sarawak, : No reason given.


  
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