赤毛である確率

赤い髪の色は、2種類のメラニン色素が特定の量で結合した結果であり、最終的に特徴的なオレンジ色を決定します。さらに、このメラニン色素の特徴的な生成は、肌の色、あるいは目の色も一緒に決定することができます。

Red hair coloration is due to the production of pheomelanin and very little eumelanin. Pheomelanin consists of a photosensitive pigment that gives it a red or light maroon-pink color, giving rise to the characteristic orange hair color. Eumelanin, on the other hand, is a dark brown or black pigment, so its low concentration results in light blond hair, and thus the red hair color is hidden when a higher amount of eumelanin is present. Additionally, the color of the hair can vary throughout life, especially with age as melanin production decreases over time, and is conditioned by environmental factors such as sun exposure.
The presence of red hair occurs in Caucasian populations and is generally associated with lighter skin pigmentation and the presence of freckles, although this is not necessarily always the case. It is also usually related to green, hazel and amber eye color, due to the presence of pheomelanin. The highest frequency of redheads is found in northwestern Europe, for example, in Scotland, 13% percent of the population has red hair followed in frequency by Ireland. In the Rif region of Morocco and Kazan (Russia) it is also characteristic due to European migrations and the isolation of these population groups, although nowadays, also due to migrations, redheads can be found all over the European continent, the United States, Australia etc.