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EvC Forum ⇒ Science Forums ⇒ Origin of Life ⇒

Problems with the first life

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Topic: Problems with the first life

pink sasquatch

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Message 16 of 138 (124659)
07-15-2004 3:31 AM

Reply to: Message 1 by tubi417
07-14-2004 3:03 AM

Without an ozone layer this cell would receive heavy doses radiation from the sun- obviously this would kill it.

In addition to all of the other excellent responses in this thread,

Dosing of the first cell or pre-cells with radiation would have increased mutation/breakage/rearrangement rate in the nucleic acids of those cells, thus potentially accelerating evolution.

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	Message 17 by coffee_addict, posted 07-15-2004 3:40 AM	pink sasquatch has replied
	Message 20 by tubi417, posted 07-15-2004 2:52 PM	pink sasquatch has replied

pink sasquatch

Member (Idle past 6050 days)

Posts: 1567

Joined: 06-10-2004

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Message 23 of 138 (124750)
07-15-2004 3:35 PM

Reply to: Message 20 by tubi417
07-15-2004 2:52 PM

Tubi-

Crashfrog and I do not contradict each other's arguments.

See Percy's message #21 - it is clear and concise.

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pink sasquatch

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Posts: 1567

Joined: 06-10-2004

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Message 101 of 138 (134981)
08-18-2004 2:44 PM

Reply to: Message 17 by coffee_addict
07-15-2004 3:40 AM

radiation as early selection

For anyone interested in the once-mentioned topic regarding the effects of radiation on abiogenesis, early life, and evolution:

Here's full text of a peer-reviewed journal article that models how UV radiation can act as a selective force to drive RNA evolution.

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	Message 17 by coffee_addict, posted 07-15-2004 3:40 AM		coffee_addict has replied

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pink sasquatch

Member (Idle past 6050 days)

Posts: 1567

Joined: 06-10-2004

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Message 125 of 138 (185890)
02-16-2005 2:00 PM

Reply to: Message 114 by mihkel4397
02-16-2005 10:28 AM

most conservative estimates

The most conservative estimates indicate that random mutations of the chimp genome to that of Homo Sapiens would take some 100 million generations or something on the order of a billion years.

Would you explain how these estimates were made? Or provide an accessible source that describes them?

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	Message 114 by mihkel4397, posted 02-16-2005 10:28 AM		mihkel4397 has replied

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	Message 129 by mihkel4397, posted 02-16-2005 3:56 PM	pink sasquatch has replied
	Message 135 by JonF, posted 02-16-2005 6:00 PM	pink sasquatch has replied

pink sasquatch

Member (Idle past 6050 days)

Posts: 1567

Joined: 06-10-2004

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Message 136 of 138 (186066)
02-17-2005 1:03 AM

Reply to: Message 129 by mihkel4397
02-16-2005 3:56 PM

Re: most conservative estimates

I provided three references in an earlier posting 02/16/05.

I know you did. You listed a 17-year-old popular press article, a textbook, and a popular religous pseudoscience book.

That's why I asked for the calculations. If you can't describe the calculations and their underlying assumptions, you shouldn't be arguing in their favor.

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pink sasquatch

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Posts: 1567

Joined: 06-10-2004

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Message 137 of 138 (186068)
02-17-2005 1:09 AM

Reply to: Message 135 by JonF
02-16-2005 6:00 PM

Re: most ignorant estimates

Hey JonF,

Thanks for the info. I assumed the Schroeder book would be along those (tired old) lines.

I was particularly amused by his line:

Schroeder writes:

Can this have happened by random mutations of the genome? Not if our understanding of statistics is correct.

See, Schroeder never actually states that his understanding is correct, so I guess he's off the hook for his profound ignorance.

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