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Author Topic:   Introduction to Genetics
dwise1
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Message 77 of 236 (719442)
02-14-2014 1:31 AM


Speciation
In the topic, Bill Nye vs. Ken Ham, we had gotten to the point of needing to determine how long a speciation event would take. I'm talking post-coital barriers, to the point where genetic differences would prevent interbreeding between the new species and the parent species.

How long, in number of generations, would we expect that to take? Is it due to specific mutations, or just a general increase in difference between the genomes?


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dwise1
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Posts: 3712
Joined: 05-02-2006
Member Rating: 4.6


Message 82 of 236 (719477)
02-14-2014 10:52 AM


In the topic, Bill Nye vs. Ken Ham, Faith presented a standard creationist claim which we have discussed at length. That claim is that the Ark was loaded with a small number of breeding pairs, each representing one of the basic created kinds and that each pair was front-loaded with an immense amount of genetic variability which then enabled the amazingly rapid evolution into the vast numbers of descendant species that now exist.

Here is how the Wikipedia article, Genetic variability:

quote:
Genetic variability is a measure of the tendency of individual genotypes in a population to vary from one another.

Can it be said that a single pair of organisms possess a vast amount of genetic variability? Or any individual? Or isn't it that you need to have a population in order to compare the individual genomes of its members to determine how much those individual genomes vary with each other?

IOW, in order for there to be a kind on the Ark with a large amount of variability, then you would have had to have loaded an entire population of hundreds or thousands of individuals and not just one single breeding pair?


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dwise1
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Posts: 3712
Joined: 05-02-2006
Member Rating: 4.6


Message 109 of 236 (719534)
02-14-2014 7:48 PM
Reply to: Message 107 by herebedragons
02-14-2014 6:47 PM


Re: Factual versus interpretive tendentious terminology
Personally I don't like to use the words microevolution or macroevolution. I really see no distinction between the two, and using the terms just causes confusion and divisiveness.

Actually, I had never seen those terms before until creationists started using them as part of their "variation within created kinds" rhetorics. So as far as I know, they're creationist terms anyway! So why would a creationist feel compelled to avoid them?

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