Redheads have a genetic variant of the MC1R gene that causes their melanocytes to primarily produce pheomelanin. However, a study published in 2018 has lead scientists to believe that there many be a number of other genes associated with pheomelanin that controls hair colour.
Previous studies had shown that redheads inherit two versions of the MC1R gene that leads to red hair – one from their mum and one from their dad. Although almost everyone with red hair has two copies of the red-haired version of MC1R, not everyone carrying two red-haired versions is a redhead.
Red hair is most commonly found at the northern and western fringes of Europe; it is centred around populations in the British Isles and is particularly associated with the Celtic nations.
Redheads actually have less hair than most other people. On average they only have 90,000 strands of hair while blonds, for example, have 140,000. However, red hair is typically thicker so it still looks just as full.
Research indicates that redheads have higher thresholds for pain and need less vitamin D than the rest of us thanks to the MC1R gene mutation, which gives their hair its hue.
Naturally Produce More Vitamin D
Per a study published in 2020 in Experimental Dermatology, redheads are more efficient at synthesizing vitamin D. The vitamin is crucial for bone health and may protect against depression and fight off colds.
Most (natural) redheads will have brown eyes, followed by hazel or green shades.
Red hair is caused by a mutation in the MC1R gene. It's also a recessive trait, so it takes both parents passing on a mutated version of the MC1R gene to produce a redheaded child. Because it's a recessive trait, red hair can easily skip a generation.
Someone with red hair has two copies of the MC1R gene, receiving one from each parent. The gene also carries a certain mutation in most people who have red hair. It's this variant that has been identified as playing a role in why redheads may respond to pain drugs differently than others.
How many redheads are there? Less than 2% of the world's population has red hair. The highest concentration of redheads is in Scotland (13%), followed by Ireland (10%).
Ireland has the highest per capita percentage of redheads in the world -- anywhere from 10 to 30 percent, according to Eupedia, a website that explores European genetics and ancestry. They are almost equally prevalent in Scotland and other pockets of Celtic pride.
Red hair has long been associated with Celtic people. Both the ancient Greeks and Romans described the Celts as redheads. The Romans extended the description to Germanic people, at least those they most frequently encountered in southern and western Germany. It still holds true today.
The Vikings maybe brought a few red-hair genetic variants over with them, but the majority of redheads were already here.” Previously it has been argued that Scotland's poor climate was responsible for the high frequency of the ginger mutation.
So what does that all mean for your chances of having a red-headed child? Since you need two pieces of “red hair” DNA to have red hair, your child will only have red hair if they receive “red hair” DNA from both parents. Even if you don't have red hair, you can still pass on a red hair allele to your child!
It has long been known that redheads are at higher risk of sunburn and skin cancer. This is to be expected because red hair is associated with fair skin, which is more vulnerable to UV radiation [1].
Both parents must possess the gene for a red-haired child to be born. Redheads have fewer strands of hair on their heads. If they both just have the gene but have brown hair lets say then there is a 1 in 4 chance of having a baby with red hair.
We found that redheads were significantly more sensitive to cold pain perception, cold pain tolerance, and heat pain tolerance. Heat pain perception threshold was also lower, but not significantly so, in redheads.
Conclusion: Red hair is the phenotype for mutations of the melanocortin 1 receptor. Our results indicate that redheads are more sensitive to thermal pain and are resistant to the analgesic effects of subcutaneous lidocaine.
Blue- Royal blue or any deep blue makes red hair pop. Blue teal and turquoise hues, as well the ever popular blue denim, are great choices. Even navy works, especially for brighter red hair colors. Navy and ivory is a winning combo for dress and casual clothes.
Despite plenty of debunked “studies” that pop up around the internet every few years, redheads are not going extinct.
Recessive traits like red hair can skip generations because they can hide out in a carrier behind a dominant trait. The recessive trait needs another carrier and a bit of luck to be seen. This means that it can sometimes take a few generations to finally make its presence known.
The redhead gene
MC1R is responsible for producing the skin pigment melanin, which redheads can't produce because of the mutation. This same gene is responsible not only for hair and skin color, but also for the midbrain function that determines pain response.
Most redheads have pink undertones in the skin which can appear ruddy.
Green is considered by some to be the actual rarest eye color in the world, though others would say it's been dethroned by red, violet, and grey eyes. Green eyes don't possess a lot of melanin, which creates a Rayleigh scattering effect: Light gets reflected and scattered by the eyes instead of absorbed by pigment.
Most redheads have a gene mutation in the melanocortin 1 receptor (MC1R). When MC1R is inactivated, the body produces more pheomelanin, which is responsible for reddish skin and hair tones, than eumelanin, which is responsible for shades of brown and black.