How long does one species have to be separated before it becomes two?

Question

I guess my question is about the genetic mutations that take palace throughout time. For example, if you had 100 modern humans and 2 Neandertals and they were breeding with each other, how long would it take for the Neandertal genes to disappear? I assume there is a standard constant rate (in general) for genetic chnage. Could you also try an list your sources so I can read about it.

Thanks!

Answer 1

The 2 Neanderthals would have fought off the moderns, won, and escaped instead of breeding with inferiors.

Answer 2

They wouldn't dissapear. They would be passed down through generations.

Answer 3

There is no set number of years (or more accurately, generations) for that kind of change.

But, if you are asking how long would it take a minority contributors contributions dilute to the point of being untraceable, not long at all

Assuming that everyone has two children, and that one male and one female are Neanderthals.

There's a 25% chance that neither the Neanderthal Y chromosome or Mt DNA would make it into the next generation.

It's actually pretty easy to loose traces like this. One South American country did a Y chromosome sweep and found NO native Y chromosomes, even though a fifth of the MtDNA was native.

Adding 2% variation would make bog all difference to the overall appearance of the people three generations down the line. The only thing it would really do is expand their gene pool and give them more genetic variety, always a good thing.

Think about the kids you know with one black grandparent, who are mostly white. For the most part, you wouldn't know they were 1/4 black.  

The level of difference from the pre-interbreeding  humans would be barely discernable at 2% Neanderthal.

Maybe at 10% you'd start getting some changes being obvious in a minority of people. personally that's the level I suspect the interbreeding would have been at.

Answer 4

50/50 would be in the first baby made by a neandertal and morden human and so on! guess

Answer 5

Why do people not just believe that "take note of spelling" (Neanderthals) were not a different species, they were just ugly Humans. Either that or they were Apes, so we could not have interbred with them. We can't have it both ways.

  The fossil record is not going to throw up a missing link just to suit  the Evolution theory. Why should it , it has never ever given us one yet in 550million years.  Lylo Lil.

Answer 6

Lylo talks a lot of sense