In Biology class Akane learns about a Punitt's(SP?) Square. For
those who aren't familiar with that, it's a chart that more or less
indicates what color eyes one's child will have. Akane learns that two
brown-eyed parents cannot have a blue-eyed child (unless both parents are
heterozygotes, which is rather rare).

I don't think this is true.  My mother is Chinese, and thus is obviously
homozygous for brown eyes.  My father is caucasian, and he has brown eyes.
His father is Greek and has brown eyes.  His mother is West European and
has green eyes.

My younger brother has green eyes, but there's no way he could be
homozygous for green eyes because my mother is homozygous for brown.

Anyone know?

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-Ukyou, from Zen's _The Long and Winding Road_