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Evolution Requires Reduction in Genetic Diversity

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Author Topic:   Evolution Requires Reduction in Genetic Diversity
DBlevins
Member (Idle past 3796 days)
Posts: 652
From: Puyallup, WA.
Joined: 02-04-2003

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Message 54 of 1034 (691810)
02-25-2013 1:45 PM 		Reply to: Message 53 by Taq
02-25-2013 1:36 PM

Re: Ring Species -- Greenish Warbler -- and Genetic Diversity
I don't want to gang up on Faith so I'll just make a point here that I think she might be missing that I'm not sure if you might have brought up already.
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There is a difference between genotype and phenotype, such that a large beaked bird may still have within it's genotype the genes for a smaller beak, just as it is possible for a brown eyed human to have a gene for blue eyes. Faith seems to believe that when a new variation comes into play, it totally wipes out all other genes and there is no such thing as recessive or unexpressed genes.
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 Message 53 by Taq, posted 02-25-2013 1:36 PM Taq has not replied
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DBlevins
Member (Idle past 3796 days)
Posts: 652
From: Puyallup, WA.
Joined: 02-04-2003

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Message 266 of 1034 (692415)
03-02-2013 6:56 PM 		Reply to: Message 58 by Faith
02-25-2013 2:23 PM

Re: Ring Species -- Greenish Warbler -- and Genetic Diversity
If it does, it's replacing another allele for beak type anyway you know, and surely all the possible beak types are already present in the gene pool so this "increase in diversity" is redundant and as I keep pointing out, once it gets selected the genetic diversity starts getting reduced anyway so it really amounts to nothing new in the end.
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No, it is not replacing another allele for beak type. It is an addition to possible allele types.
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Not all possible beak types are present. Unless you think a crow could be born with a toucan's beak?!?
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