Here's a breakdown by region:
* Ireland: Holds the highest prevalence of red hair, with around 10% of the population having red hair.
* Scotland: Around 13% of people have red hair.
* England: About 6% of the population has red hair.
* United States: Roughly 2% of the population has red hair.
* Other regions: The prevalence is significantly lower in other parts of the world.
Factors influencing red hair rarity:
* Genetic inheritance: Red hair is determined by a recessive gene variant (MC1R) that must be inherited from both parents.
* Geographical location: The highest concentration of red hair is found in northern Europe, specifically in Ireland, Scotland, and England.
* Sunlight exposure: Sunlight can fade red hair, making it less noticeable in populations with higher sunlight exposure.
It's important to note that these are just estimates, and the actual prevalence can vary depending on the specific region and population.