Homo sapiens – simple english wikipedia, the free encyclopedia electricity measurements units

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The hypothesis that humans have a single origin was published in Charles Darwin’s The Descent of Man (1871). The concept is supported by a study of present-day mitochondrial DNA, and with evidence based on physical anthropology of fossil humans. According to genetic and fossil evidence, older versions of Homo sapiens evolved only in Africa, between 200,000 and 100,000 years ago, with members of one branch leaving Africa by 90,000 years ago and over time replacing earlier human populations such as Neanderthals and Homo erectus.

Sequencing of the full Neanderthal genome suggests Neanderthals and some modern humans share some ancient genetic lineages. The authors of the study suggest that their findings are consistent with Neanderthal admixture of up to 4% in some populations. The reason for this admixture is not known. [9] In August 2012, a study suggested that the DNA overlap is a remnant of a common ancestor of both Neanderthals and modern humans. [10] [11] Evolution [ change | change source ] Further information: Human evolution

Scientific study of human evolution is mostly concerned with the development of the genus Homo, but usually involves studying other hominids and hominines as well, such as Australopithecus. "Modern humans" are defined as the Homo sapiens species, of which the only living subspecies is known as Homo sapiens sapiens.

Homo sapiens idaltu, the other known subspecies, is now extinct. [12] Homo neanderthalensis, which became extinct 30,000 years ago, has sometimes been classified as a subspecies, " Homo sapiens neanderthalensis". Genetic studies now suggest that the functional DNA of modern humans and Neanderthals diverged 500,000 years ago. [13]

Until recently it was thought that anatomically modern humans first appeared in the fossil record in Africa about 195,000 years ago. Studies of molecular biology suggested that the approximate time of divergence from the common ancestor of all modern human populations was 200,000 years ago. [14] [15] [16] [17] [18] The broad study of African genetic diversity found the ǂKhomani San people had the greatest genetic diversity among the 113 distinct populations sampled, making them one of 14 "ancestral population clusters". The research also placed the origin of modern human migration in south-western Africa, near the coastal border of Namibia and Angola. [19] [20]

In the 1960s an archaeological site at Jebel Irhoud in Morocco was dated as about 40,000 years old but it was re-dated in the 2000s. It is now thought to be between 300,000 and 350,000 years old. The skull form is almost identical to modern humans, [21] though the jaw is different.

• ↑ Global Mammal Assessment Team (2008). " Homo sapiens". The IUCN Red List of Threatened Species ( IUCN) 2008: e.T136584A4313662. doi: 10.2305/IUCN.UK.2008.RLTS.T136584A4313662.en . http://www.iucnredlist.org/details/136584/0 . Retrieved 12 January 2018.

• ↑ Hua Liu et al 2006. A geographically explicit genetic model of worldwide human-settlement history American Journal of Human Genetics 79, 230–237, quote: "Currently available genetic and archaeological evidence is generally interpreted as supportive of a recent single origin of modern humans in East Africa. However, this is where the near consensus on human settlement history ends, and considerable uncertainty clouds any more detailed aspect of human colonization history".

• ↑ Henn, Brenna; Gignoux, Christopher R.; Jobin, Matthew (2011). "Hunter-gatherer genomic diversity suggests a southern African origin for modern humans". Proceedings of the National Academy of Sciences of the United States of America ( National Academy of Sciences) 108 (13): 5154–62. doi: 10.1073/pnas.1017511108.