A lot of evidence out there proves evolution beyond all reasonable doubt. It ranges from the similarity between our own DNA and that of the chimpanzee all the way up to chimp chromosome #13.
Today I'd like to talk about Endogenous Retroviruses, How they prove evolution and how they prove that we and the chimpanzee, At some point in the past, Shared a common ancestor.
For those who don't know Endogenous Retroviruses are molecular remnants of a past parasitic viral infection. Occasionally, copies of a retrovirus genome are found in its host’s genome, and these retroviral gene copies are called endogenous retroviral sequences. Retroviruses make a DNA copy of their own viral genome and insert it into their host’s genome. If this happens to a germ line cell (i.e. the sperm or egg cells) the retroviral DNA will be inherited by descendants of the host.
So what does this mean and how does it prove evolution? Well, When a Retrovirus infects the host it will leave behind a tell tale sign, Like a calling card, In the hosts genome. This calling card is then passed on to the hosts offspring in cases where the genome change was made in a Germ cell.
So if evolution is correct we should find that we share Retrovirus DNA with chimpanzees, And we do, At numerous locations in our genome. Could this be a coincidence? Well it could, But it is highly unlikely. For it to be a coincidence humans and chimpanzees would have had to get infected by the same viruses and have the viruses insert the DNA change in exactly the same place. So as humans have around 3 billion base pairs and retroviruses generally insert their DNA randomly it's impossible that ourselves and chimpanzees would have the same instances of retrovirus DNA at the same locations unless we inherited it from a common ancestor.
This evidence is even more compelling when we learn that we share multiple instances of retrovirus DNA with chimpanzees, All of which occur in the same locations in our genome. The odds against this happening by chance in a genome with 3 billion base pairs is astronomical.