When "Adam" was on Earth ?

Researcher University of Sheffield, Dr. Eran Elhaik, and the University of Houston, Dr. Dan Graur, claiming the male ancestors of modern man, known as Adam, had lived 9,000 years earlier than scientists previously estimated.

Elhaik adding he and his colleagues to make sure Adam has appeared earlier than expected.

"We can say with certainty that some modern humans appeared in Africa at least 200,000 more than last year," he added.

According to two British researchers, as reported by Dailymail, Friday, January 24, 2014, Adam has lived in mainland Africa 209 000 years ago. The results of this study conflict with previous studies.

To determine the age of "Adam," the two researchers used genetic data that already exist today, such as calculating the Y chromosome, the male gene. Researchers calculated by multiplying the age of the Y chromosome genetic data on the average age of fathers who had their first child by the number of mutations found in research.

Researchers then dividing that figure by the Y chromosome mutation rate This is to find out how the average year is needed to determine the appearance of mutations. Indeed, this mechanism has the potential to manipulate recognized genetic variables. However, both studies show they actually present manipulations in previous studies.

"In our paper, previous studies manipulate all the variables for age precedes Y chromosome," said Elhaik.

Not Single

Elhaik also argue that modern humans interbred with hominin (human relatives who are closer to chimpanzees) that lived more than 500,000 years ago.

"It is also clear that no single Adam and Eve, but that there is a group of Adam and Eve who lived side by side and wander together on Earth," he said.

Previous studies University of Arizona, claiming the human Y chromosome is derived from a different species by mating twice that age older than Adam. According Elhaik, University of Arizona study indisputable.

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