I want to know the answer to the following question:
What can one use to look at differences between groups instead of physical differences?
All the background I'm provided with is that "The Human Genome Project states "People who have lived in the same geographic region for many generations may have some alleles in common, but no allele will be found in all members of one population and in no members of any other."". Is that enough to answer the question?
Answer: no