5 ms·

What lead to this?

by DougMerritt 1y ago

What lead to this?

kjkjadksj 1y ago
Founder effect
skywhopper 1y ago
Africa is where humans originally come from. There’s much more human history in Africa than the rest of the world.
- djohnston 1y ago
  Existence, not history. History requires writing.
  - layer8 1y ago
    That’s a narrow definition of “history”. See for example https://en.wikipedia.org/wiki/History_of_Earth https://en.wikipedia.org/wiki/History_of_Earth.
  - saltcured 1y ago
    The above seems clear as genetic history written in the DNA. Those bottlenecks are a bit like burning the library at Alexandria.
- DougMerritt 1y ago
  ...which needs more to explain it, such as (if true): "the diversity originating in Africa did not migrate out of Africa, and the gene lines that did leave Africa did not develop as much diversity as had existed in the ancestral gene pool, despite facing far more diversity in climate than exists in Africa". And then I would again ask of the latter, "what? Why not?" Ultimately: Why did Africa stimulate so much gene pool diversity? It seems more homogenous in environments than the rest of the world that Homo Sapiens emigrated to. And there would have been cross-breeding between African subpopulations. Environmental barriers in sub-Saharan Africa are minimal in terms of gene movement, aren't they?
  - marssaxman 1y ago
    Perhaps there simply hasn't been time. Large scale migration out of Africa is a recent phenomenon relative to the existence of anatomically modern humans.
1659447091 1y ago
TL;DR: You may be interested in - https://www.nature.com/articles/nature15393 https://www.nature.com/articles/nature15393 Bottlenecks, small population inbreeding, genetic drift, founder effect, etc Basically what happened was, an alt-group of African humans decided earth was not safe anymore and its collapse was imminent -- they need to get to Mars. But since they don't have a way to get a spaceship in Africa, they will need to leave Africa and do whatever is necessary to build one, including throwing the people who helped them under the mammoth if need be. At this point they have a pretty diverse gene pool and represent the humans well. They walk for a bit but came upon some steam vents and decided take a break and steam some food and enjoy the ocean view in the distance. The leader is not happy they stopped for food or rest. Later they are shooketh awake just before fire rains down on them. 3/4th of them make it safely to the ocean, and what luck the water is receding it'll be easier to cross, for the first 2/3rds at least. The tsunami gods demanded a toll and claimed the back 1/3. Not happy with the direction of leadership, half the group decided they could establish a better foundation away from these clowns and forked themselves. Meanwhile, back in Africa and finally having got rid of that crazy mars dude and his cult followers, they decide to invite all the neighbors to an epoch swinging dance party to celebrate -- complete with the best plant-based party favours they could dig up/gather. Thus, ensuring the larger African population and their descendant would end up with an abundant supply of pokemon variants to swap between'em. Though, you may want to take a look at the linked paper above for a more precise explanation. I may have paraphrased a bit.

What lead to this?

kjkjadksj 1y ago

Founder effect

skywhopper 1y ago

Africa is where humans originally come from. There’s much more human history in Africa than the rest of the world.

djohnston 1y ago
Existence, not history. History requires writing.
- layer8 1y ago
  That’s a narrow definition of “history”. See for example https://en.wikipedia.org/wiki/History_of_Earth https://en.wikipedia.org/wiki/History_of_Earth.
- saltcured 1y ago
  The above seems clear as genetic history written in the DNA. Those bottlenecks are a bit like burning the library at Alexandria.
DougMerritt 1y ago
...which needs more to explain it, such as (if true): "the diversity originating in Africa did not migrate out of Africa, and the gene lines that did leave Africa did not develop as much diversity as had existed in the ancestral gene pool, despite facing far more diversity in climate than exists in Africa". And then I would again ask of the latter, "what? Why not?" Ultimately: Why did Africa stimulate so much gene pool diversity? It seems more homogenous in environments than the rest of the world that Homo Sapiens emigrated to. And there would have been cross-breeding between African subpopulations. Environmental barriers in sub-Saharan Africa are minimal in terms of gene movement, aren't they?
- marssaxman 1y ago
  Perhaps there simply hasn't been time. Large scale migration out of Africa is a recent phenomenon relative to the existence of anatomically modern humans.

1659447091 1y ago

TL;DR: You may be interested in - https://www.nature.com/articles/nature15393 https://www.nature.com/articles/nature15393 Bottlenecks, small population inbreeding, genetic drift, founder effect, etc Basically what happened was, an alt-group of African humans decided earth was not safe anymore and its collapse was imminent -- they need to get to Mars. But since they don't have a way to get a spaceship in Africa, they will need to leave Africa and do whatever is necessary to build one, including throwing the people who helped them under the mammoth if need be. At this point they have a pretty diverse gene pool and represent the humans well. They walk for a bit but came upon some steam vents and decided take a break and steam some food and enjoy the ocean view in the distance. The leader is not happy they stopped for food or rest. Later they are shooketh awake just before fire rains down on them. 3/4th of them make it safely to the ocean, and what luck the water is receding it'll be easier to cross, for the first 2/3rds at least. The tsunami gods demanded a toll and claimed the back 1/3. Not happy with the direction of leadership, half the group decided they could establish a better foundation away from these clowns and forked themselves. Meanwhile, back in Africa and finally having got rid of that crazy mars dude and his cult followers, they decide to invite all the neighbors to an epoch swinging dance party to celebrate -- complete with the best plant-based party favours they could dig up/gather. Thus, ensuring the larger African population and their descendant would end up with an abundant supply of pokemon variants to swap between'em. Though, you may want to take a look at the linked paper above for a more precise explanation. I may have paraphrased a bit.