Answer:
Someone may inherit blue eyes if the two parents give this required genes to. But blue eyes are a recessive trait, therefore, it is less common, unless both parents have a homozygous recessive trait for blue eyes, which gives you a hundred percent chance for blue eyes, but you can't control whether you give that. There are three types of trait passed on by parents: a homozygous dominant trait, a homozygous recessive trait, and a heterozygous trait. Everyone has at least one kind of these. Let's say for example B=brown eye color (dominant), and b=blue eye color (recessive). A homozygous dominant trait would look like: BB, a homozygous recessive trait would look like: bb, and a heterozygous trait would look like: Bb. Then to have the blue eyes, the child MUST have the homozygous recessive trait, because the dominant trait ALWAYS wins. The Punnett Square helps determine the percent chance of blue eyes-if you know the parents' eye traits. There is always chance that one of the parents doesn't have the blue eyes genes too. Luckily, I just learned this today in school and I've put together a tutorial-go here: http://tinypic.com/r/5afera/7. (: