This article explains exactly what endogenous retroviruses are, the many distinctive features that leave no doubt as to their identity, and how they provide crushingly strong evidence for common ancestry. The argument from endogenous retroviruses to evolution in general, and to specific family trees, is to my mind one of the most immediately convincing (compare http://www.talkorigins.org/pdf/comdesc.pdf, 29+ Evidences for Macroevolution, Sec. 4.5).
As the article points out, the odds against any ERV occurring in the same place in humans and chimps is about 1 in 10^4; humans and chimps share 100,000 ERVs in the same locations, and the odds against this would then be 1 in 10^400,000. By my arithmetic, allowing for the 0.1% where there is no match changes this to 1 in 10^399,800, still a ridiculously vast number.
I would also have welcomed numbers showing where gorillas, for instance, fit into the picture, and numbers of ERVs specific to each species.
The final section of this post is addressed to those who, like the author, regard the Bible as divinely inspired but not as literally true. The argument goes back to Maimonides, if not Augustine, and here forms part of the ongoing civil war within the Abrahamic religions between Fundamentalists and Modernists. Not my battle.
Introduction to Endogenous Retroviruses
Advances in biochemical technology since 2000 have allowed us to determine the full DNA sequences for humans and other animals. This new information has illuminated our evolutionary history. A number of patterns in our DNA are consistent with a common ancestry of humans and other primates.
One such genetic feature is the distribution of endogenous retroviruses (ERVs) in our genomes. As most readers know, viruses work by introducing their RNA or DNA into a host cell, and hijacking the host cell’s genetic machinery to start making more copies of the virus. Some viruses, called “retroviruses”, do this by having their RNA transcribed into DNA, which then gets inserted into the cell’s DNA genome. (This is considered “retro”, because normally in a cell DNA is transcribed into RNA, not the other way around). The HIV virus that causes AIDS is an example of a retrovirus. Once the…
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