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Is Earth old enough for DNA to evolve?

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Author Topic:   Is Earth old enough for DNA to evolve?
Panda
Member (Idle past 3740 days)
Posts: 2688
From: UK
Joined: 10-04-2010

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Message 5 of 60 (668096)
07-17-2012 6:05 AM 		Reply to: Message 1 by bcoop
07-17-2012 4:15 AM

bcoop writes:
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Problems:
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a. 3 billion generations would take 60 billion years if each female reproduced at the age of 20.
b. It is stated that life on earth is only 2 billion years old.
I think if you answer these questions you will see one of the the flaws in your argument...
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Q: How many people are alive today?
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Q: How many children were born in the 200,000 years since homo sapiens evolved?
CRYSTALS!!
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 Message 1 by bcoop, posted 07-17-2012 4:15 AM bcoop has replied
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 Message 12 by bcoop, posted 07-17-2012 9:24 AM Panda has replied
  
Panda
Member (Idle past 3740 days)
Posts: 2688
From: UK
Joined: 10-04-2010

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Message 19 of 60 (668121)
07-17-2012 11:12 AM 		Reply to: Message 12 by bcoop
07-17-2012 9:24 AM

Re: probably is a flaw
bcoop writes:
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...if there are a million people reproducing any number of them may have a positive mutation all at the same point in time.
Yes.
And they could also all have different individual mutations.
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bcoop writes:
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a. 3 billion generations would take 60 billion years if each female reproduced at the age of 20.
Q: How many people are alive today?
A: ~7 billion.
To create those 7 billion people took more than 7 billion generations (in the sense you were referring to generations).
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Q: How many children were born in the 200,000 years since homo sapiens evolved?
A: ~100 billion (current estimate).
This is 100 billion chances at mutations while homo sapiens have existed - and we are a comparatively slow breeding species.
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Q: How many of our evolutionary cousins were born in the 2 billion years before homo sapiens evolved?
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I am going to guess at much more than 100 billion.
CRYSTALS!!
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