Use of Genetic Markers
The Genographic Project relies on the identification of genetic markers. Most human DNA is a shuffled combination of genetic material passed down the generations. There are, however, parts of the human genome that pass unshuffled from parent to child. These segments of DNA are only changed by occasional mutations—random spelling mistakes in the genetic code. When these spelling mistakes are passed down to succeeding generations, they become markers of descent.
Different populations have different genetic markers, and by following them through the generations scientists are able to identify the different branches of the human tree, all the way back to their common African root. Indigenous populations provide geographical and cultural context to the genetic markers in their DNA. These clues can help recreate past migration patterns.
Read more about this topic: Genographic Project
Famous quotes containing the word genetic:
“Nature, we are starting to realize, is every bit as important as nurture. Genetic influences, brain chemistry, and neurological development contribute strongly to who we are as children and what we become as adults. For example, tendencies to excessive worrying or timidity, leadership qualities, risk taking, obedience to authority, all appear to have a constitutional aspect.”
—Stanley Turecki (20th century)