Genealogy has made a pretty solid case in recent years that points the origins of man to Africa. It even goes so far as to state that in terms of genetics, humanity stems from a single man and woman. Scientific Adam and Eve ‘emerged’ from what is now Tanzania between 60,000 and 200,000 years ago.
From there humanity spread out all over the world.
When humans first ventured out of Africa some 60,000 years ago, they left genetic footprints still visible today. By mapping the appearance and frequency of genetic markers in modern peoples, scientists created a picture of when and where ancient humans moved around the world. These great migrations eventually led the descendants of a small group of Africans to occupy even the farthest reaches of the Earth and eventually grew into a global population of 8 billion people to date.
The “Zinj” is a fossil found in Tanzania in 1959. The discovery of this cranium proved (to those who wanted to believe it) that human life began in Africa over three million years ago.
Foot prints preserved in volcanic ash, found in 1978. showed that the first human beings stood upright in Africa almost four million years ago. These were footprints of what seemed to be a man, woman, and child.
[SIZE=7]Mitochondrial Eve[/SIZE]
In human genetics, the Mitochondrial Eve (also mt-Eve, mt-MRCA) is the matrilineal most recent common ancestor (MRCA) of all living humans. In other words, she is defined as the most recent woman from whom all living humans descend in an unbroken line purely through their mothers and through the mothers of those mothers, back until all lines converge on one woman.
[SIZE=7]Mitochondrial Eve[/SIZE]
We were all born from our parents. Our parents were all born from our grandparents. Everyone has a family tree and a root. If so, is it possible to find the beginning of mankind – our true “root”?
Our cells have an organelle (a part of the cell) called mitochondria. Mitochondria act as the cell’s engine and allow the cell to generate energy through respiration. An interesting fact about them is that they are not originally “ours”. About 1.5 billion years ago, there was an event where a prokaryote (cells without a nucleus, like a bacteria) invaded (or was eaten by) a eukaryote (cells with nuclei, like our cells). The prokaryote and the cell began a symbiosis and the prokaryote became a part of the cell.
Due to the external origin of mitochondria, they have a different genome to us. This is called mitochondrial DNA, shortened to mtDNA, which allows mitochondria to divide and synthesise proteins without the help of the host cell. It used to be a completely independent organism, but it has lost some of its functions to the cell.
mtDNA is inherited in a different way to normal DNA. Normally we receive half of our mother’s and half of our father’s genes, but we only inherit our mother’s mtDNA. This is because sperm keeps mitochondria in the tail which is lost during fertilisation, meaning our father’s mitochondria cannot be inherited. The only way to gain mitochondria is from those in the cytoplasm (the material that fills cells) of our mother’s egg. This is known as maternal inheritance.
Using this information, scientists compared a large sample of people’s mtDNA to turn back the clock. Knowing that a child and its mother share the same mtDNA and the mother and grandmother share the same mtDNA, we can analyse mtDNA to find the origin of mankind, or our first common female ancestor – also called Mitochondrial Eve.
Mitochondrial Eve is estimated to have lived 200,000 years ago in Africa, thus she is also known as African Eve. Her mtDNA is an ancient heirloom passed along generation after generation to us, as evidence of evolution. Every living person on the face of the Earth is a descendant of her. So in some ways, it could be said that we truly are one big family.
These things are usually guesswork. there is no solid proof linking any subhuman fossil finding with modern humans. No DNA link whatsoever. It is possible that these are all extinct primate species. natural selection is perhaps the only theory with some substance. nothing also explains why humans have little gene variance.