Our "Missing" Chromosomes

This evidence laid the groundwork for a brilliant discovery. Rather than falling apart, the two missing chromosomes had fused together. Their format changed, but they didn't lose any information, so the mutation wasn't deadly. Instead, scientists now think, the fusion made it difficult for our ancestors to mate with the ancestors of chimpanzees, leading our two species to strike out alone. In the two decades since the original study, more evidence has surfaced backing this up, which leads us to 2005, when the chimpanzee genome was sequenced around the same time that the National Human Genome Research Institute published a detailed survey of human chromosome 2. According to Kenneth Miller, we can now see extra centromeres in chromosome 2 and trace how its genes neatly line up with those on chimpanzee chromosomes 12 and 13. It's a great example of evidence supporting the common descent of man and ape.