- Percentage Of People Who Have It: 1%
Heterochromia is one of the rare genetic traits a lot of people know about by now. The reason for this is likely due to how obvious it is that a person has it. This is a genetic trait that causes a person to have two different colored eyes. However, those with different colored sections in each eye are also said to have this. In rare cases, a person with this trait might also see a difference in color for other body parts too. This can be a difference in skin color, hair, etc.
All of this comes down to how the genetic mutation works. Our eye color is affected by the melanin in our body. Heterochromia is the result of a mutation that led to an error in the distribution of melanin before a person was born. Of course, the most dramatic and obvious heterochromia cases are those with broadly different eye colors, specifically in the iris. It can be really wild to see but often beautiful. Interestingly, only 1% of the world’s population has any version of heterochromia.