Here's why:
* Genetics: Red hair is caused by a mutation in the MC1R gene. People inherit two copies of this gene, one from each parent. To have red hair, a person typically needs to inherit two copies of the mutated MC1R gene. However, in some cases, inheriting only one copy can still result in reddish tones in hair.
* Mixed Ancestry: Biracial individuals inherit genes from both of their parents, representing different ancestral backgrounds. If both parents carry the MC1R mutation (even if they themselves don't have red hair), there's a chance their child could inherit both copies and express the red hair phenotype. Even if only one parent carries the gene, there is a chance the child could have reddish tones in their hair.
* All Racial Groups Carry the Gene: While red hair is more commonly associated with people of Northern European descent, the MC1R gene mutation exists in all racial groups, though at varying frequencies.
* Examples: There are numerous examples of biracial individuals with red hair, demonstrating that it is indeed possible.
So, a biracial person can have red hair if the genetic factors align for them to inherit the necessary genes for red hair expression.