A research team has finally completed the sequence of the human genome, filling in the last 8 percent of the genome's 3 billion nucleotides. These regions were hard to place on chromosomes because they are very repetitive. Around the centromere, the newly added sequences reveal layers of repetitive DNA added over time, which could help reveal details of human evolution in Africa. The centromeric regions, critical to chromosome segregation, could give clues to disorders of segregation.
