B
Benedictus
Guest
Mostly correct, but we don’t all have the same mtDNA; although, we can all trace our mtDNA to the same woman who lived 140,00 years ago. There have been many mutations since (mtDNA mutates more often than nuclear DNA), and mtDNA is quite useful in numerous fields, since it can be used to determine or track a person’s ancestry through female lines.We all came from one mother and one father. Biology explains this through Mitochondrial DNA and Y-Chromosome DNA. Mitochondrial DNA is a section of DNA that comes directly from the mother, and remains unchanged from one generation to the next; it doesn’t get mixed or recombined with the fathers mitochondrial DNA. So you have the same Mitochondrial DNA as your siblings, and since it doesn’t change from generation to generation, you have the same Mitochondrial DNA as your grandmother and great-grandmother, and so on. Everyone in the human population (accounting for genetic mutations) has the same Mitochondrial DNA, proving that we are all descendants from one mother; the Y-Chromosome DNA is the male genetic counterpart to that, showing we all come from one father.
Umm… no. The unfortunately named Mitochondrial Eve and Y-Chromosomal Adam, from whom all living humans can trace their ancestry through strictly matrilineal and patriarchal descent respectively were not alive at the same time nor were they the only woman or man alive at the time.So genetics proves that we all come from one set of parents.
While the idea of Mitochondrial Eve and Y-Chromosome Adam are interesting, they do not prove that we are all descended from only one original couple. The two lived tens of thousands of years apart (“Eve” having lived around 140,000 years ago and “Adam” 60,000 years ago).
Currently there is no science that proves–or even suggests–that we’re all descended from exactly one original pair of humans.