Re: Evolution is definately not a fact

On Sat, 06 May 2006 23:02:07 +1000,
John Wilkins <john@xxxxxxxxxxxxx> wrote:

[snip]

I said "I guess" in there :-) I am unsure what to think about
the eukaryotes-first hypothesis. Does it have a lot of support?

It's not widely believed but there is scientific support. Several
ancient genes show the earliest split is between eukaryotes on
the one hand and all prokaryotes on the other. These trees are
very robust and they refute the Three Domain Hypothesis.

There are many papers that have analyzed eukaryotic genomes. The
results are consistent. About half of all eukaryotic genes don't
have orthologous relatives in prokaryotes. Similarly, there are
many prokaryotic genes that aren't found in eukaryotes.

Scientists who believe that eukaryotes arose recently from
prokaryotes (or fusions of prokaryotes) have developed several ad
hoc explanations for all the novel genes. They assume that there
was a rapid evolution of new genes at the time of the split
about two billion years ago. Scientists who believe that the
split was more ancient don't have to reconcile the data because
they expect there to be novel genes in the two primitive lineages.

The issue is very much up in the air but the vast majority of
scientists don't know this. They think the Three Domain Hypothesis
has been proven and eukaryotes evolved mostly from archaebacteria
about two billion years ago.



Larry Moran

.

Relevant Pages

  • Article: Is the Term Prokaryote Obsolete?
    ... Such proposals have sustained the concept that prokaryotes ... evolved into eukaryotes -- an evolutionary model invoked by the terms ... first of ribosomal RNA genes in the late ... Comparisons of ribosomal RNA sequences show a three-domain tree of life. ...
    (sci.bio.evolution)
  • Biology Reborn
    ... being shattered are old notions of genes and inheritance. ... scientists have regarded the "gene" as the fundamental ... Crick and Watson's discovery of the DNA double ... diseases and human traits. ...
    (talk.origins)
  • Genetic breakthrough that reveals the differences between humans
    ... Scientists hail genetic discovery that will change human understanding ... The discovery has astonished scientists studying the human genome - the ... having multiple copies of some key genes that make up the human genome. ... genetics at the Baylor College of Medicine in Houston, ...
    (alt.support.mult-sclerosis)
  • Re: Genetic breakthrough that reveals the differences between humans
    ... Scientists hail genetic discovery that will change human understanding ... The discovery has astonished scientists studying the human genome - the ... having multiple copies of some key genes that make up the human genome. ... why some people are prone to serious diseases. ...
    (alt.support.mult-sclerosis)
  • Re: Are we becoming gods?
    ... This is no "end of science", ... simply cataloguing genes but manipulating them; ... Let's start with the intelligence revolution. ... Last year, its scientists hit the ...
    (soc.culture.romanian)
Loading