Naked Science Forum

Life Sciences => Plant Sciences, Zoology & Evolution => Topic started by: Europan Ocean on 14/10/2020 17:50:05

Title: How far back in time does one need to look to find the one tribe all come from?
Post by: Europan Ocean on 14/10/2020 17:50:05

If we want to find the original tribe from which we all descend, how far back in time need we look? And where did they live?

Title: Re: How far back in time does one need to look to find the one tribe all come from?
Post by: Bored chemist on 14/10/2020 17:51:52

Does this help?
https://en.wikipedia.org/wiki/Recent_African_origin_of_modern_humans

Title: Re: How far back in time does one need to look to find the one tribe all come from?
Post by: evan_au on 14/10/2020 21:42:09

There is greatest genetic diversity of humans in Africa - that is a powerful hint that this is the origin of all humans.
- But some humans travel widely (and tend to mate wherever they travel), so populations are surprisingly well mixed today

There is a concept called "The Most Recent Common Ancestor" (TMRCA), which is a person who all people in a population have as an ancestor.
- It is suggested that for Europeans, this may be as recently as Charlemagne (800 AD)
- For all humans, some estimates place it as recently as 300 BC. The location of this person is speculative - but probably not in Africa.
 
There is another concept called a "genetic isopoint", which is a time when all people in a population have the same set of ancestors; any person living then is either:
      1. The ancestor of all living people or
      2. Has no living descendants.
- This time is is older than TMRCA
- For Europeans, this is estimated at 5,000 to 15,000 years ago.
- For all humans, it is thought to be over 100,000 years ago, in Africa

See:
https://en.wikipedia.org/wiki/Most_recent_common_ancestor
https://en.wikipedia.org/wiki/Identical_ancestors_point

Title: Re: How far back in time does one need to look to find the one tribe all come from?
Post by: alancalverd on 14/10/2020 23:54:44

Adam, 4004 BC, Israel. It's as useful as any other guess, and the cowardly idiot the BBC calls Leader of the Free World probably believes it, so you better accept it, or the truly righteous will be gunnin' for ya come November.

Title: Re: How far back in time does one need to look to find the one tribe all come from?
Post by: Bored chemist on 15/10/2020 13:17:03

Quote from: alancalverd on 14/10/2020 23:54:44

It's as useful as any other guess

But not nearly as useful as actual information- as opposed to guessing.
You do know this is a science site, don't you?

Anyway, If I read this
https://en.wikipedia.org/wiki/Hominini
 correctly, our tribe, Hominini, split from the gorillas about 6.4 million years ago. (in Africa- obviously).

Title: Re: How far back in time does one need to look to find the one tribe all come from?
Post by: alancalverd on 15/10/2020 14:04:34

So?


 note to admin - where's the tongue-in-cheek emoticon?

Title: Re: How far back in time does one need to look to find the one tribe all come from?
Post by: Bored chemist on 15/10/2020 14:55:50

Quote from: alancalverd on 15/10/2020 14:04:34

 note to admin - where's the tongue-in-cheek emoticon?

There isn't one.
:-)

Title: Re: How far back in time does one need to look to find the one tribe all come from?
Post by: evan_au on 15/10/2020 21:29:13

Quote from: alancalverd

note to admin - where's the tongue-in-cheek emoticon?

If emoticons fail you, try your emoticon thesaurus....

This is listed as a synonym: ;) or "; )"