Subject: Very interesting, yes...
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Posted on: 2010-05-09 18:03:00 UTC

http://en.wikipedia.org/wiki/Endogenous_retrovirus

Basically, when a virus reproduces, it uses the host cell to reproduce its own genetic material. Sometimes that genetic material stays in the host cell. If it does that, and does it in a reproductive cell (sperm/egg), it can be passed to the next generation, hitching a ride in the genome of the organism the virus has infected.

Viral DNA is part of the reason for the junk DNA in the human genome. Viruses also play a role in transferring genes from one organism to another, especially for little one-celled organisms that just divide instead of swapping genes through sexual reproduction.

Disclaimer: I am in biomedical engineering, not genetics or virology. So this is from an amateur perspective. Someone who knows more about it than me can probably correct or elaborate on this.

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