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

Uno Lapideus wrote to sci.bio.evolution on the 01/12/2005:

> [moderator's note: This is clearly based on a
> misunderstanding - or several misunderstandings - and
> I've seen this sort of argument from creationists, but
> since no mention is made here of that banned topic, let's
> educate politely, shall we? -- JAH]
>
>
> All numbers shown are, to the best of my understanding,
> representing "current knowledge" according to what I can
> find on the web... Corrections are more than welcome,
> but please give sources!
>
> Assume 150 000 000 base pairs in the first multicellular
> organism (this is probably a very generous assumption).
>
> There has been 800 000 000 years of evolution since the
> first multicellular organism.
>
> There are 3 150 000 000 base pairs in the human genome
> (3.15Gbp).
>
> This means that 3 000 000 000 base pairs has been added
> in 800 000 000 Years... By random mutations in the germ
> line... All of them favourable! All of them
> "saturating" the existing genome! Wow!
>
> That is, on average, 3.75 favourable base pairs added to
> the genome *per year*, irrespective of numerous
> catastrophic global extinction events... (comments,
> PLEASE!)
>
> All coming to pass due to mindless, random, germline DNA
> replication errors? Is this to be considered at all
> possible???
>
> The following is more clear using a fixed space font:
>
> Time Required to Evolve (MYR = Megayears, MYA = Megayears
> ago):
>
> Life Form MYR MYA
> ================================
> Hominids 568 12
> Primates 525 55
> Placentals 460 120
> Mammals 390 190
> Therapsids 300 280
> Reptiles 250 330
> Amphibians 205 375
> Lung Fish 170 410
> Jawed Fish 115 465
> Vertebrates 80 500
> Hard-body organisms 30 550
> Ediacaran Fossils 0 580
>
> Time From Earlier Form:
>
> Ediacaran Fossils 3000 580
> Hard-body organisms 30 550
> Vertebrates 50 500
> Jawed Fish 35 465
> Lung Fish 55 410
> Amphibians 35 375
> Reptiles 45 330
> Therapsids 50 280
> Mammals 90 190
> Placentals 70 120
> Primates 65 55
> Hominids 43 12
> Average MYR/New Form 52
>
> In simple graph form, time from slime to * (in Excel, the
> correlation is more obvious):
>
> MYR
> 600
> * (Hominids, 568 MYR)
> 550
> * (Primates, 526)
> 500
>
> 450 * (Placentals, 460)
>
> 400 * (Mammals, 390)
>
> 350
>
> 300 * (Therapsids, 300)
>
> 250 * (Reptiles, 250)
>
> 200 * (Amphibians, 205)
> * (Lung fish, 170)
> 150
> * (Jawed fish, 115)
> 100 * (Vertebrates, 80)
> * (Hard-body organisms, 30)
> 0
>
> Note the "steady" rate of (on average) 52 MYR/new major
> form: the curve from slime to me is virtually straight as
> an arrow!
>
> BTW, is the "gap" between therapsids and mammals somehow
> significant? Should the list be augmented with some form
> between them?
>
>
> I find it interesting that I have not been able to find
> this type of compilation anywhere on the net (if you know
> of a site that does, please share!).
>
> Am I the only one discerning a clear pattern here?
>
> Seeing this straight line of evolution from "simple" to
> "complex," from the Ediacaran to humans, how can anyone
> call this "random"? Shouldn't we at least expect
> something resembling a random walk pattern? Please help
> me understand this!
>
> Uno
au sein du forum de News sci.bio.evolution

Ce à quoi je me propose de répondre:

Just a last thing: human genome is far not the biggest one
(4000 Mb, and some plants from the Liliaceae family have
more than 1 000 000 Mb!), and not the most complex (25-35
000 genes, more than 35 000 in wheat/barley even in their
diploid form). The only thing different with human is the
level of intelligence. And this is not a genetic or genomic
componant.

The size of genome does not reflect the complexity of an
organism nor its evolution level!

--



.

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