What are the genetics behind hazel eyes?

Has any progress been made in explaining eye colors other than brown, blue, and green? read more

Eye color is determined by up to a combination of 16 different genes. You can think about a certain eye color as a combination of different levels of different pigments encoded for by different genes. read more

In a second eye color gene let's say that G confers green or hazel eyes and g results in lighter eyes. In simple terms in one gene the B allele confers brown eye color, and the recessive b allele gives blue eyes. In another gene G confers green or hazel eyes and g would confer lighter eyes. read more

Brown eyes have a lot of melanin in the iris, green eyes have less, and blue eyes have little or no pigment. Two genes, bey2 and gey, work together to make brown, green, or blue eyes. Each gene comes in two versions or alleles. read more