Scientists have found that people with blue eyes often have a specific genetic variation in the oca2 gene. This variation reduces the production of melanin in the iris,. The mutation responsible for blue eyes likely occurred on a single allele initially. This means that the original ancestor carrying the mutation may not have had blue eyes themselves but was. Blue eyes, for example, are the result of a mutation in the oca2 gene that reduces the amount of melanin produced in the iris.
The mutation responsible for blue eyes likely occurred on a single allele initially. This means that the original ancestor carrying the mutation may not have had blue eyes themselves but was. Blue eyes, for example, are the result of a mutation in the oca2 gene that reduces the amount of melanin produced in the iris. This reduction in melanin leads to less.
This reduction in melanin leads to less.
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