Final answer:
There is only about a 0.1 percent variation in genes between conventional "racial" groups, with more genetic variation existing within these groups than between them; thus, race is not a scientifically valid concept.
Step-by-step explanation:
Considering the conventional geographic "racial" groupings such as Africans, Asians, and Europeans, there is only about a 0.1 percent variation in genes from one group to another. This means that there is much greater variation within each of the traditional "races" than between them. The concept of race is not scientifically valid, as anthropologists, biologists, and geneticists have found that most genetic variation is within, not between, the "races". The genetic markers that are often associated with racial categories, like skin color or hair texture, represent a minute fraction of our genetic code.
Furthermore, the social construct of racial classification could shift dramatically if different characteristics were chosen as the basis. For example, if grouping were based on height, fingerprint patterns, or blood type, our current racial categories would be entirely different. It's important to understand that much of how we perceive and categorize race is based on social, rather than biological, distinctions.