More recent research has shown that up to 16 genes (not just one or two) may influence eye color, which makes predicting eye color much more difficult.
Due to variations in the interaction and expression of multiple genes, it's hard to say for sure what color a child's eyes will be based on the color of his or her parents' eyes. For example, we now know it's possible for two blue-eyed parents to have a child with brown eyes — something the old model of eye color inheritance would have deemed impossible.Also, eye color can change dramatically in the first few years of life; many white, non-Hispanic babies are born with blue eyes and then develop brown, green or hazel eyes in childhood. This phenomenon has little to do with genetics, but it does help explain where hazel eyes come from.
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