Originally Posted By: ImagingGeek
Yes & no. In animals there is a tenancy to accumulate both extra genes and towards the accumulation of junk DNA (junk meaning the DNA is not required to maintain the fitness of the organism).

Bryan, this is something I have wondered about. I think I recall that all of the DNA that wasn't genes was considered junk, then they found out a lot of the junk was actually there to control the transcription of the genetic information. How confident are we that the rest is really junk? I know that one thing you mentioned is that it does take resources to support the extra, so it might seem that it would get deleted over time.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.