Out of africa is bullshit prove me wrong

Genetic resistance to malaria never became "extinguished" in Europe, it was an innovation in West African populations.

How is being recessive an argument in your favor?

>but somehow, in just the 10,000 years since humans "left" africa, all of these recessive traits are barely even found in northern europe!!

Do you really know what this means?

>deleterious recessive trait persists due to heterozygote advantage
>heterozygote advantage goes away due to change in environment
>50,000 years later, or ~2500 generations, deleterious trait is gone
can't explain that

I Don't Understand This, Therefore It's Bullshit: The Thread

>these traits are recessive traits, and confer only advantages to carriers.
Utter bullshit. Everything you listed causes anemia and other harmful side effects. It's no surprise that changes to the structure of such critical proteins is selected against except when they confer a larger advantage due to malaria being rampant.

>additionally, in the 400 years that blacks have been in the USA, where malaria is not seen, this recessive trait did not decline at all.
Utter bullshit. The prevalence of sickle cell anemia among African Americans is only 5% of the prevalence in Africans. This is partly due to admixture with non-Africans, but admixture cannot explain all of the extreme difference. Additionally, we know that the rate is still falling among African Americans.

So the basic premises of your argument are dead wrong.

Malaria is found in West Africa and not in the higher altitude and relatively dry climate of East Africa.

Humans originate in East Africa in the region near Ethiopia, Sudan and Kenya where prior to trade malaria was uncommon.

Your entire post is irrelevant.

this desu

>but somehow, in just the 10,000 years since humans "left" africa, all of these recessive traits are barely even found in northern europe!! somehow, in just 10,000 years, a recessive trait that has no bad effects was selected out of the entire population to the point they are not seen in entire populations in northern europe.

Reminder to op that the out Africa theory posed that small migratorial populations left the continent.

It is very possible that those populations had low to no percentage of individuals that carried the trait. And even if they did due to the lack of environmental pressure several thousand years would easily be enough time to be completely selected out of the new genome due to ill adaptation of the individuals/family line that had it or assortive mating practices.

Also sickle cell trait does have negative effects, any two individuals who have the trait and procreate with each other allows the chance for the offspring to not only have the trait but the crippling disease associated with it. Which before modern medicine was a guaranteed death sentence and potentially a genetic dead end if the parents weren't constantly pumping children out in the off chance of one surviving to adulthood.

Gotta love how there's still idiots that think they found the absolute refusal to a theory and post it on Veeky Forums

[spoiler]and they're always wrong[/spoiler]

Out of Africa is the theory that humans began in Africa NOT HURR WE CAME FROM NIGGERS DURR.

Out of Africa actually builds up a case for black people to be seen as devolved primitives compared to Eurasian homo sapiens.

Many of us are no longer in Africa.
>Checkmate.