In his article on human evolution Graeme Finlay states that duplicated DNA segments prove evolution. Finlay’s proof is straightforward. These duplications of DNA segments arise randomly and yet identical duplications are found in cousin species, such as humans and chimpanzees. Finlay uses as his example opsin genes which produce proteins that are light sensitive. Different opsin genes produce proteins that are sensitive to different colors of light. The proteins are found in the hundreds of millions of photocells in our retina and they allow us to sense the different colors of light that we see. By combining the signals from these different photocells, our brain can assemble a full color image. Read more