At best, a hair color calculator can provide an educated guess at the color of a fetus' hair. For best accuracy, provide the hair color calculator with the hair color of mother, father, and both maternal and paternal grandparents.Continue Reading
Hair color is a polygenic trait, meaning it cannot be explained as simply as the combination of mother's hair color plus father's hair color, notes About.com. Instead, it is determined by the interaction of several genes, or alleles, which appear in different places within a person's DNA.
As an article from the Tech Museum of Innovation explains, hair color results from a pigment called melanin, which itself is a result of many genes. Each of these genes can be inherited in the "on" or "off" position. The more "on" genes inherited, the darker the hair.Learn more about Hair Color