旧石器时代非洲即有人类迁徙活动
文章来源:未知 文章作者:enread 发布时间:2016-05-31 08:34 字体: [ ]  进入论坛
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The Palaeogenomics study conducted by the Human Evolutionary1 Biology group of the Faculty2 of Science and Technology, led by Concepción de la Rua, in collaboration3 with researchers in Sweden, the Netherlands and Romania, has made it possible to retrieve4 the complete sequence of the mitogenome of the Pestera Muierii woman(PM1)using two teeth. This mitochondrial genome corresponds to the now disappeared U6 basal lineage, and it is from this lineage that the U6 lineages, now existing mainly in the populations of the north of Africa, descend5 from. So the study has not only made it possible to confirm the Eurasian origin of the U6 lineage but also to support the hypothesis that some populations embarked6 on a back-migration to Africa from Eurasia at the start of the Upper Palaeolithic, about 40-45,000 years ago. The Pestera Muierii individual represents one branch of this return journey to Africa of which there is no direct evidence owing to the lack of Palaeolithic fossil remains7 in the north of Africa.
 
"Right now, the research group is analysing the nuclear genome the results of which could provide us with information about its relationship with the Neanderthals and about the existence of genomic variations associated with the immune system that accounts for the evolutionary success of Homo sapiens over other human species with whom it co-existed. What is more, we will be able to see what the phenotypic features of early Homo sapiens were like, and also see how population movements in the past influence the understanding of our evolutionary history," explained Prof Concepción de la Rúa.


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1 evolutionary Ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
2 faculty HhkzK     
n.才能;学院,系;(学院或系的)全体教学人员
参考例句:
  • He has a great faculty for learning foreign languages.他有学习外语的天赋。
  • He has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。
3 collaboration bW7yD     
n.合作,协作;勾结
参考例句:
  • The two companies are working in close collaboration each other.这两家公司密切合作。
  • He was shot for collaboration with the enemy.他因通敌而被枪毙了。
4 retrieve ZsYyp     
vt.重新得到,收回;挽回,补救;检索
参考例句:
  • He was determined to retrieve his honor.他决心恢复名誉。
  • The men were trying to retrieve weapons left when the army abandoned the island.士兵们正试图找回军队从该岛撤退时留下的武器。
5 descend descend     
vt./vi.传下来,下来,下降
参考例句:
  • I hope the grace of God would descend on me.我期望上帝的恩惠。
  • We're not going to descend to such methods.我们不会沦落到使用这种手段。
6 embarked e63154942be4f2a5c3c51f6b865db3de     
乘船( embark的过去式和过去分词 ); 装载; 从事
参考例句:
  • We stood on the pier and watched as they embarked. 我们站在突码头上目送他们登船。
  • She embarked on a discourse about the town's origins. 她开始讲本市的起源。
7 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
TAG标签: immune Africa genome
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