SouthStar's Request

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Over on Kevin's skeptic blog, he has put up a request thread and sstar (aka southstar) requested:

Okay I have one, regarding chromosome 2. At a particular point in time there must have been one and one only single ancestor that was born with the fused chromosome.
He/she was the only one of his species with this particular mutation. Now we know that species with different chromosome count can't interbreed. So how is it possible for this mutation to have be passed and how is it possible for the mutation to have become totally dominant through natural selection as it seems to be neutral. I have read some of the articles on pandas thumb but they do not seem to be very convincing (or more likely I didn't quite understand them).

1- Kevin doesn't think it's a problem because he doesn't think there was ever any mismatch. Ya see I have brought this up to him before, that a fusion would have one gamete with 23 chromosomes which would have to pair with a gamete with 24 (for a total of 47). And he rejected that and prattled ignorantly about how meiosis would prevent 47. Even after I explained why the 47 is mandatory, that is outside the highly improbable chance of the gamete with 23 finding a mate with 23, he refused to have any of it.

So I don't think he will respond to your request. Or, if he does, he will give you the same refuted tripe he tried to sell me.

2- Within the same species gametes with different chromosome numbers can come together and form a viable organism.

3- Natural selection isn't the only player

4- Your entire scenario is wrong and the fused chromosome is a design feature