For many years, Irish and Scots have been linked with red hair, light complexion, and freckles. People with whiter complexion and red hair developed because they absorb vitamin D more quickly than people with deeper skin tones. The same is true for people who are bald; their scalp doesn't produce as much of the vitamin.
In Ireland and Scotland, people with red or blond hair are called "brunettes" or "redheads", respectively. These terms come from the colors associated with brunescence in those countries - brunette is used for women and redhead for men.
In Ireland, this coloration is due to a recessive gene that is present in 1 in 4 people. It can show up anywhere on an individual's body, but most often appears on the face and head.
In Scotland, it's also thought to be related to genetics, but it's also attributed to an infection by the parasite melanoma bacillus. This idea comes from the fact that people with blonde hair usually don't have any problems with melanomas, while people with red hair often get them early in life when they are less common than for people with darker hair.
Overall, people with red or blond hair are at increased risk of developing skin cancers compared to people with other colors of hair.
Irish guys have red beards due to convoluted hair color genetics and living in an unquestionably gorgeous land that doesn't receive much sun. Having pale skin and red hair is maybe the oddest survival feature that anyone has ever developed in the history of ever.
Actually, no it doesn't. According to some studies, Irish men were originally black Africans who came to Ireland hundreds of years ago. Since then, they've been interbreeding with Europeans, resulting in people with white skin and dark hair. There are also theories that say Irish men have red beards because they used to worship gods with red beard images in Africa. But none of this explains why there are so many beautiful women in Ireland.
The truth is that there are lots of factors involved in how people appear around the world. Genetics play a role, but also environment, age, health, and even politics can affect how you look. For example, black Americans tend to have darker skin than white Americans, even though they are both members of the same species. That's because most black Americans live in climates where exposure to sunlight is not as important for skin cancer prevention as it is for whites.
In Ireland, there are very few people with black skin, so geneticists don't know what kind of traits they might be passing on to future generations.
According to recent study from a prominent DNA lab, Irish people's red hair originated as a result of a lack of sunshine. Ireland's DNA found that one in every ten Irish individuals had red hair, although it is believed that up to half of the population has the redhead gene even if they are blonde or brunette. The reason for this is that the redhead gene comes in two forms, either RHD or RHDE. People who have the RHDE form of the gene do not experience red hair themselves, but they are more likely to give birth to children who do.
The RHD gene comes in three forms: null, V, and S. Individuals who are null carriers have no functional RHD gene product at all, while those who are V carriers produce a partially functioning protein. Those who are S carriers still produce full-strength RHD proteins but they are unable to bind to K-hair strands properly which leads to hair that is yellow/golden instead of red.
In Ireland, it was first thought that most redheads were born with their color, but research shows this isn't true. Instead, it appears that people with red hair are born with it because there is not enough full-strength RHD genes around to explain how so many people got red hair. Scientists think that maybe some people have multiple copies of RHD, or they may have mutations that prevent their RHD genes from being expressed.