S**********e
发帖数: 173 | | T******8
发帖数: 1858 | 2 怕曝光？
【在 S**********e 的大作中提到】
: 看图说话 (答案在11楼)
| s****e
发帖数: 257 | | s****e
发帖数: 257 | 4 老人与女孩服饰一样，是老奶奶和孙女。
【在 s****e 的大作中提到】
: 老牛吃嫩草？
| S**********e
发帖数: 173 | 5 hoho
【在 s****e 的大作中提到】
: 老人与女孩服饰一样，是老奶奶和孙女。
| n*2
发帖数: 19062 | | i*****s
发帖数: 15215 | | l*******l
发帖数: 13923 | 8 re
【在 s****e 的大作中提到】
: 老人与女孩服饰一样，是老奶奶和孙女。
| I***i
发帖数: 14557 | | B***e
发帖数: 214 | 10 No idea.
【在 S**********e 的大作中提到】
: hoho
| S**********e
发帖数: 173 | 11 答案就在下面的文章里
http://www.dailymail.co.uk/sciencetech/article-2207097/Genetic-
Genetic study challenges theory that modern humans came from just one place
in Africa
The theory that modern humans came from one place in Africa has been
challenged by new research.
A study showed the Khoe and San peoples of the sub-Sahara are descendents of
the earliest diversification event in the history of all humans, some 100,
000 years ago.
The findings, involving 220 participants representing 11 populations across
southern Africa , revealed around 2.3 million DNA variants per individual,
according to the journal Science
Stark landscape: A San bushwoman stands before the vast Sahara desert
Rich genetic data: Two San bushmen on the dunes of Africa's Kalahari desert
This was thought to be due to interbreeding and genetic stratification - non
-random mating between groups.
A group of international scientists from Sweden and South Africa conducted
the largest genomic study ever among the click-speaking Khoe and San groups.
Researchers estimate that the San populations from northern Namibia and
Angola separated from the Khoe and San populations living in South Africa as
early as 25,000 -- 40,000 years ago.
Dr Carina Schlebusch, of Witwatersrand University in Johannesburg, told
Science: 'There is astonishing ethnic diversity among the Khoe-San group
Tribe: A young girl and an old woman of the San people
We were able to see many aspects of the colorful history that gave rise to
this diversity in their DNA.'
Many scientists believe modern humans originated from one region in Africa
before spreading into Europe and Asia about 60,000 years ago.
Others theorise there were several 'movements' out of Africa.
'It is possible that modern humans emerged from a non-homogeneous group,'
said Mattias Jakobsson from Sweden's Uppsala University, one of the authors.
The genetic data also showed how generations of Khoe-San adapted to their
environment which involved muscle function, immune response, and UV-light
protection.
Farming skills developed and spread across southern Africa with genetic
contributions between a southern San group and people in east Africa.
The Science journal reported how researchers focused on signals across the
genome of ancient adaptations that happened before the historical separation
of the Khoe-San lineage from other humans.
Co-author Pontus Skoglund, from Uppsala, said: 'Although all humans today
carry similar variants in these genes, the early divergence between Khoe-San
and other human groups allowed us to zoom-in on genes that have been fast-
evolving in the ancestors of all of us living on the planet today.'
The study is to be made freely available for future disease-related studies. | S**********e
发帖数: 173 | 12 You got it, a young girl and an old woman.
【在 s****e 的大作中提到】
: 老人与女孩服饰一样，是老奶奶和孙女。
| S**********e
发帖数: 173 | 13 You got it too.
【在 l*******l 的大作中提到】
: re
| S**********e
发帖数: 173 | 14 你猜了什么？
【在 n*2 的大作中提到】
: 这是什么？
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