Question

What evidence would you like to see that would convince you one way or the other of the “out of Africa” hypothesis, or are you convinced?  As a scientist, evaluate the evidence.

Answer 1

Answer: Out of Africa hypothesis generally confirms the most recent origin of modern humans. The hypothesis suggests that every living human being on this planet has a common ancestry or we can say is descended from a small group of humans in Africa. These small group of African peoples is then dispersed widely throughout the world replacing the earlier humans such as Neanderthals.

Now, such a claim needs a broad sense of evaluation on the part of there migration, their hereditary linkages or any genetic similarity with genetic diversity, evidence which is based on the need and entire process of migration to the different parts of the world, Changes seen in the comparative economic development on migration etc.

In my view, there is a lot of strong evidence supporting this hypothesis in its favor. The points which need attention on the part of favoring this hypothesis are as follows :

1) There are various fossils of homo sapiens found in the African region which dates back to around 1,90,000 years old while the fossils of homo sapiens found outside Africa are not so old as compared to these.

2) Studies suggest that there is a significant amount of genetic variation found in the modern humans of Africa compared to other. The closer analysis of the mtDNA of modern humans in the African region shows us the great diversity exhibited in the African population. The variations which are seen in the mtDNA are only the result of mutations and when such mutations gets accumulated for a long period of time, they shows a greater amount of variations in the older populations. The regions which are far away from the African region shows less amount of variation.

3) The Y chromosome analysis also suggests similar kind of results like the previous one as in the case of mtDNA analysis where a greater amount of diversity is observed in studies.

4) There are various studies conducted to examine the DNA at the nuclear level Neanderthal and Denisovans in order to look for any kind of similarity. It is found that they were totally distinct species but due to some interbreeding among them and non- African population, there are some contributions made by the Neanderthals and Denisovans towards the genetic variations within them.

All these evidence widely suggest their existence and supports the hypothesis to be true and well acceptable.