Volcano Girl wrote on Dec 25th, 2009 at 2:58pm:oh_noes wrote on Dec 25th, 2009 at 2:45pm:That would depend on how far along the genes were to fixation in the population. Those with natural immunity have increased fitness and so the probability of their genes spreading would increase. The rate of spread would be dictated by the advantage conferred, and i don't know the figures.
I would suggest that the genes failed to become fixed because it is now hypothesized that black plague immunity might confer immunity, or at least some resistance, to HIV, but it is also clear that many Europeans do not have this resistance.
The gene is likely to be wide spread however and could well be on it's way to fixation.
Your right, appologies for being a bit imprecise, put it down to seasonal intke of food.
But yes, the rate of spread would depend on how many people had the mutation(s), and also if there was one instance of a beneficial mutation or more than one. Also bear in mind that after something like that there would likely have been pressure for lots of babies (with lots of oportunities for the genes to be passed on). However this is a fair amount of assuming on our part, and not theres also the fact i'm talking outside of my specialism.
On to something i can say clearly, and you'll need to accept my appologies for not having a link sorted in relation to this. The mutated allele that codes for cystic fibrosis is thought to pose an advantage to fertility, i.e. if you are a carrier it improves your fertility. Now i'm a bit shakey on the specifics as it was a while ago that i did this (i dabbled in first year genetics and evolution at uni) but it was when i did a number of lectures on genetic disorders. I will dig about on wiki to see if i can find a place for you to start on this.
WTF does this have to do with evodelusionism?
Where is your absolute evidence, irrefutable and physical.
This is bovine feculence, conjecture by idiot brainwashed and now we can ad arrogance and delusional believers.
It is clear to any sane person that you take all sorts of fantasy ideas and run a muck with them, when there is no scientific evidence to back it.
No creature has ever evolved into an entirely new species, much less a genus or "clad". No fish has ever evolved into a reptile. No reptile has ever become a bird or mammal. No creature has violated the laws of genetics and become something totally new.
There are two things contained in evidence of the fossils as badly dated as they are.
1/ Creatures came into existence, remained the same, in some cases over 50,000,000 years (or much more by some dating systems) by your dating, and then went extinct when the environment was not suitable for their existecne.
2/ We have aprox 90% of the existing vertebrate fossils of the non bird creatures now living. They look identical to the ones still living. Because we have the huge majority of fossils of current creatures, up to 125,000,000 years old, this shows the fossilization is more common than the religious believer in the pseudo science of evolution want to accept.
There exists no magical processes, or mystical voodoo in science. You are supposed to just look at evidence and transh your, garbage Evodelusionism religious idea. This is the nature of human emotional mental garbage, contained in beliefs that are not founded in reality nor science.
Evolution is a pseudo science and causes people to be stupid. Beliefs destroy credibility.