Red haired girl blue eyes

Duration: 11min 46sec Views: 470 Submitted: 27.02.2020
Category: Romantic
February 7, For every people in the world, only one or two will have red hair. And when you meet a red head with blue eyes , you are looking at the rarest colour combination of all for human beings. Around 17 per cent of people have blue eyes, and when combined with per cent having red hair , the odds of having both traits are around 0. That's 13 million people, out of the 7. The reason these looks are so unusual is because they are the result of two different sets of DNA instructions, or mutations, happening in the same person, explains Professor Mark Elgar, an evolutionary biologist from the University of Melbourne.

Are redheads with blue eyes really going extinct?

Red Hair, Blue Eyes: How Common Is the Genetic Combination?

Redheads have a particularly high abundance of pheomelanin, with very little eumelanin, which ranges from brown to black. When it's activated, it causes melanocytes to specifically produce eumelanin over phenomelanin, which balances out an individual's ratio. Contrastingly, redheads are born with a genetic variant that causes MC1R to chemically function differently on melanocytes, which leads to less eumelanin and more pheomelanin production. These genetic variants are recessive, meaning in order to be born a redhead, either non-redhead parents are carriers 25 percent , or one parent is a redhead and the other is a carrier 50 percent ; or both parents are redheads almost percent. This makes redheads rare and unique both on the outside and inside. Red hair occurs naturally in one to two percent of the human population, while just 17 percent of the world's population has blue eyes.

Why Red Hair And Blue Eyes Is So Rare, Plus 4 Other Surprising Facts About Redheads

And when you meet a red head with blue eyes, you are looking at the rarest colour combination of all for human beings. Around 17 per cent of people have blue eyes, and when combined with per cent having red hair, the odds of having both traits are around 0. The reason these looks are so unusual is because they are the result of two different sets of DNA instructions, or mutations, happening in the same person, explains Professor Mark Elgar, an evolutionary biologist from the University of Melbourne. In contrast, brown hair and brown eyes are dominant traits, which is why they are much more prevalent. In some regions of the world, red heads are more common, making up per cent of the population in Scotland and Ireland for example.
In the array of possible natural hair colors, dark hues are the most common — more than 90 percent of people worldwide have brown or black hair. Red hair, occurring in just 1 to 2 percent of the population, is the least common. Blue eyes are similarly uncommon, and they may be becoming rarer. One study found that between and , more than half of non-Hispanic white people in the United States had blue eyes.