Why didn't haplogroup A continue to mutate?

[Johnson Reed]

So, if I understand it correctly, the thing that defines haplogroups like B, C, etc... is that they mutated away from A, so then why is A still the same haplogroup it was when humans began, and why didn't it mutate the way the others did?

[~Elizabeth~]

That is a good question. Why didn't blacks evolve like Whites did?

[cass]

No hybridization with other hominids?





Map of western Eurasia showing areas and estimated dates of possible Neandertal–modern human hybridization (in red) based on fossil samples from indicated sites.

[Johnson Reed]

No hybridization with other hominids?





Map of western Eurasia showing areas and estimated dates of possible Neandertal–modern human hybridization (in red) based on fossil samples from indicated sites.

How would hybridization change the Y-chromosome, since it doesn't recombine?

[libal]

Whatever happens in Africa. Stays in Africa.

[cass]

How would hybridization change the Y-chromosome, since it doesn't recombine?

Recombination of the entire genome occurs. I assume that most or rather all successful hybridizations have involved cases of male homo sapiens and females of another species. This does not significantly affect the y chromosome but could damage and change it. I am not a biologist so I am not certain about the mechanics of the process. My guess is based on the time and place of hybridization.

[Scandal]

That is a good question. Why didn't blacks evolve like Whites did?

Different environment.

[Peterski]

It did mutate. There is A1, A1b, A1b1, A2, A2a1, etc., etc.

[Johnson Reed]

It did mutate. There is A1, A1b, A1b1, A2, A2a1, etc., etc.

But there is still A0 and A00, and I'm pretty sure that A0 and A1 are as similar as I1 and I2.

[Ygsi]

You are aware that the letters attributed to haplogroups are given by geneticists right?