When the cell divides it has to make a copy of the chromosome to partition between the two daughter cells, and there's a certain bit, the centromere, that is where sort of things attach to pull the two chromosomes apart into the dividing cells. And that is not a huge fraction of the genome, but that's another bit of it.
Keywords:
jim kent,daughter cells,interviewee,chromosomes,chromosome,genome,partition,dna,centromere,fraction
Jim Kent, the author of the assembly program for the public sequence, talks about the difficulties of reassembling small pieces of the genome when there are so many repeat sequences.