Single genes code for most traits

The majority of human features, including height, eye color, and skin tone, are determined by several genes rather than just one. Polygenic refers to a trait that is regulated by multiple genes. We witness a continuum of height and skin color because traits that are coded for by several genes do not have defined classes and instead exhibit a range.

Even eyes come in a variety of brown, blue, green, and hazel colors. According to recent studies, approximately 100 genes may have an impact on skin tone (Barsh, 2003)! For instance, each of us possesses genes that regulate the creation of melanin, the pigment most frequently linked to skin color. However, we vary in the quantity and kind of melanin that is produced (black, brown or reddish).

Many of us were misinformed while we were in high school about the dominance of brown hair over blond hair. Frequently, a Punnett square with both lowercase and uppercase letters "b" was provided with this lesson. We now realize that the inheritance of pigmentation is far more complicated and cannot be explained by a straightforward Punnett square based on a single gene.