a wide genetic variation including african gene from slave population in north south america along with asian gene imbedded in mexican indian population. believed to have my greated across the behring straight many century ago but rather than just history he says those fragment are atprofo. >> not about what the ancestry is. it's what it is in a particular gene. >>reporter: to learn more teams from the schools launched a major study in mexico sequencing the gene from hundreds of people from different area using high speed robot systems that process dozens of sample simultaneousl simultaneously. what they found was surprising. good evening netcly speaking, some group in mexico are as different from each other as european are from asian. so how much difference could one of those genes make. >> if you are of asian of a