Melanin.
purple
It is the eye color
Eye color is polygenic and controled by 4 pairs of genes .Blue eye color is totaly recessive to all other colors .
polygenic
any color humans have
The alleles for eye color result different combiantions of different eye-color shades from the offspring's parent.
The alleles for eye color result different combiantions of different eye-color shades from the offspring's parent.
It is extremely common for humans to have no earlobe to speak of . . . it is hereditary just like eye color or skin color.
Most humans will have colored eyes, the exception is albinos. Therefore the fact that two humans are twins will not stop them having colored eyes.
Color is the result of the way the brain senses the wavelengthes of light entering the eye.
brown, blue, green, and hazel