I can't be the first person to have thought of this.

DNA is used all the time now to establish paternity, as well as guilt or innocense in trials. Has anyone been working on decoding how DNA affects appearance?

For example, given a sample of DNA at a crime scene, is there anything predictive that can be surmised from the sample? Can you determine the sex, or ethnicity of people from their DNA? Unlike fingerprints, which uniquely identify people but don't offer any predictive clues to their identity (except, perhaps, their size), it seems reasonable to me that DNA, which carries the entire blueprint of the human being, should be able to yield some secrets about a person's identity.

If no-one is working on this, maybe someone should be.