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Over the next two years, through investigations into natural and artificially mummified specimens, Svante Pääbo confirmed that this phenomenon was not limited to relatively recent museum specimens but could apparently be replicated in a range of mummified human samples that dated as far back as several thousand years (Pääbo 1985a; Pääbo 1985b; Pääbo 1986).The laborious processes that were required at that time to sequence such DNA (through bacterial cloning) were an effective brake on the development of the field of ancient DNA (a DNA).They discovered that females were attracted to men who had dissimilar HLA alleles from them.Furthermore, these females reported that the body odors of HLA-dissimilar males reminded them of their current partners or ex-partners providing further evidence of biological compatibility.It can be also loosely described as any DNA recovered from biological samples that have not been preserved specifically for later DNA analyses.

Studies such as the famous sweaty t-shirty study have found that body odours are linked to sexual attraction and that people are attracted to mates with dissimilar HLA profiles, which helps increase the chances that potential offspring can fight disease.Analyzing DNA from present-day and ancient genomes provides a complementary approach for dating evolutionary events.Because certain genetic changes occur at a steady rate per generation, they provide an estimate of the time elapsed.When scientists say that modern humans emerged in Africa about 200,000 years ago and began their global spread about 60,000 years ago, how do they come up with those dates?Traditionally researchers built timelines of human prehistory based on fossils and artifacts, which can be directly dated with methods such as radiocarbon dating and Potassium-argon dating.

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