Blond and red hair colors are not naturally seen in Asian populations due to genetic factors. The primary reason is the presence of specific genes that determine hair color. The MC1R gene, which is responsible for red hair, and other genes that influence blond hair, are less common in Asian populations.
In most Asian populations, the dominant hair color is black or dark brown. This is because the genes that produce eumelanin, the pigment responsible for dark hair, are more prevalent. The genetic makeup of Asian populations typically results in higher levels of eumelanin and lower levels of pheomelanin, the pigment responsible for red and blond hair.
Additionally, the evolutionary history of different populations plays a role. In regions with higher UV radiation, such as Africa and Asia, darker skin and hair provide better protection against the sun. Over time, natural selection favored individuals with darker hair and skin in these regions, leading to the prevalence of these traits.
While it is rare, there are some exceptions where individuals in Asian populations may have naturally lighter hair due to genetic mutations or mixed ancestry. However, these cases are uncommon and do not represent the general population.