Re: How can the evolutionary progress from slime to humans be linear?


John Wilkins wrote:
> Francois Sabot wrote:
> > Uno Lapideus replied to Eva in sci.bio.evolution on the 05/12/2005:
> >
> >
> >>Eva,
> >>
> >>The reason I posted my inquiry was because I was baffled by the
> >>numbers, and I wanted to learn what was wrong with my reasoning. Which
> >>of the numbers are incorrect, and what should they be?
> >>
> >>Uno
> >
> >
> > Dear Uno,
> > As Eva told you, there is a very important phenomena which is genome
> > doubling. Humans are ancient polyploid, and all species in the plant
> > kingdoms are polyploid.
>
> Strictly speaking, some basal mammal was a polyploid. I don't think there is
> any evidence that modern humans, or any hominid we know of since the
> chimp-homo split, was a polyploid.
>
> Not all species in plants are polyploid. Around 4-6% are, as John Harshman
> finally got through my head a while back - around 75% of angiosperms and 95%
> of gymnosperms are *descendants* of polyploid events. They themselves usually
> aren't.

Do you (or Francois Sabot) perhaps refer to the 2R hypothesis (Two
Rounds of genome doubling in ancient vertebrates). It recently got some
pretty good support btw:

http://biology.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pbio.0030344
(the full text is free)

If you don't mean the 2R, then what did you have in mind?

ErikW

> ...
>
> --
> John S. Wilkins, Postdoctoral Research Fellow, Biohumanities Project
> University of Queensland - Blog: evolvethought.blogspot.com
> Nihil tam absurdum quod non quidam Philosophi dixerit - adapted from Cicero


.

Relevant Pages

  • Re: How can the evolutionary progress from slime to humans be linear?
    ... John Wilkins wrote to sci.bio.evolution on the 09/12/2005: ... >>> The reason I posted my inquiry was because I was baffled by the ... >> As Eva told you, there is a very important phenomena which is genome ... Humans are ancient polyploid, and all species in the plant ...
    (sci.bio.evolution)
  • Re: How can the evolutionary progress from slime to humans be linear?
    ... >>The reason I posted my inquiry was because I was baffled by the ... > As Eva told you, there is a very important phenomena which is genome ... Humans are ancient polyploid, and all species in the plant ... Around 4-6% are, as John Harshman ...
    (sci.bio.evolution)
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