Question

The Omo remains and mitochondrial DNA analysis suggest that the earliest humans first evolved approximately:

Answer 1

The Omo remains and mitochondrial DNA analysis suggest that the earliest humans first evolved approximately 200,000 years ago in Africa. Around 100,000 years ago, they first appeared in Southwest Asia. IN other parts of the world, they came into existence around 60,000-40,000 years ago.

Rebecca Cann, at the University of California, in the beginning of 1980's argued that mordern people who have lived in the geographic region should have the greatest amount of genetic diversity today. After her experiments by comparing the mitochondrial DNA sequences from living people throughout the world, she concluded that Africa has got the large amount of genetic diversity. She mentions, that is the reason why it must be the homeland of all modern humans.

She further concludes by assuming a constant rate of mutation, that the common ancestor of the mordern people was a woman who was living about 200,000 years ago in Africa. Some of the recent researches in the University of Chicago and Yale University also supports the replacement model. It showed that variation in the chromosome 12 and Y chromosome in the DNA also have the greatest diversity among Africans today.

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