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Scientists attempt to date genetic changes by tracing back to such spread, using a statistical model that assumes genes have a certain mutation rate over time.For the microcephalin gene, the variation arose about 37,000 years ago, about the time period when art, music and tool-making were emerging, Lahn said.Afghanistan Albania Algeria Andorra Anguilla Antigua And Barbuda Argentina Armenia Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Bermuda Bhutan Bolivia Bosnia And Herzegovina Brazil Brunei Darussalam Bulgaria Cambodia Canada Cayman Islands Chile China Colombia Costa Rica Croatia Cuba Cyprus Czech Republic Denmark Dominican Republic Ecuador Egypt El Salvador Estonia Faroe Islands Fiji Finland France French Polynesia Georgia Germany Gibraltar Greece Greenland Grenada Guam Guatemala Guernsey Guyana Haiti Honduras Hong Kong Hungary Iceland India Indonesia Iran Iraq Ireland Isle Of Man Israel Italy Jamaica Japan Jordan Kazakhstan Korea Kuwait Kyrgyzstan Laos Latvia Lebanon Liechtenstein Lithuania Luxembourg Macao Macedonia Madagascar Malaysia Maldives Malta Marshall Islands Martinique Mauritius Mexico Moldova Monaco Mongolia Montenegro Montserrat Morocco Myanmar Nepal Netherlands Netherlands Antilles New Caledonia New Zealand Nicaragua Norfolk Island Northern Mariana Islands Norway Oman Pakistan Palau Palestinian Territory Occupied Panama Paraguay Peru Philippines Poland Portugal Puerto Rico Qatar Romania Russian Federation Saint Kitts And Nevis Saint Lucia Saint Vincent And The Grenadines San Marino Saudi Arabia Serbia Seychelles Singapore Slovakia Slovenia Solomon Islands South Africa Spain Sri Lanka Suriname Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Thailand Trinidad And Tobago Tunisia Turkey Turkmenistan Ukraine United Arab Emirates UK USA Uruguay Uzbekistan Venezuela Vietnam Virgin Islands British Virgin Islands U.s. Unlike other so called "free" sites you can be guaranteed that at no stage will you be asked to pay for any of our services.
Aside from not knowing what the gene variants actually do, no one knows how precise the model Lahn used to date them is, Collins added.That the defining feature of humans — our large brains — continued to evolve as recently as 5,800 years ago, and may be doing so today, promises to surprise the average person, if not biologists."We, including scientists, have considered ourselves as sort of the pinnacle of evolution," noted lead researcher Bruce Lahn, a University of Chicago geneticist whose studies appear in Friday's edition of the journal Science.For ASPM, the variation arose about 5,800 years ago, roughly correlating with the development of written language, spread of agriculture and development of cities, he said."The genetic evolution of humans in the very recent past might in some ways be linked to the cultural evolution," he said.
Lahn's own calculations acknowledge that the microcephalin variant could have arisen anywhere from 14,000 to 60,000 years ago, and that the uncertainty about the ASPM variant ranged from 500 to 14,000 years ago.