5. Red Hair
Natural red hair is quite rare. In fact, it occurs in only 2% of the world’s population, but the percentage may differ a little — 2% to 6% — in western and northern Europe.
According to medical experts, red hair is recessive. Basically, red hair is the two of clubs in the great genetic card game. If you want to have a child with this hair color, both you and your partner need to possess the gene.
Red hair may not seem in the US. A reason would be that a disproportionate number of redheads appear in American advertisements. According to one study, 30% of ads feature natural red hair, while people born with this rare body feature only make up a tiny percentage of the population.