I'll keep this short.

        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).
        For an assignment, Akane uses the Punitt's Square, with Genma and
Nodoka, and discovers that they may not be Ranma's parents after all. Akane
ends up struggling with whether or not she should tell Ranma about it, or
even if she's right in her findings.

        It isn't much, but I wanted to see if I should run with it. Thanks!

Jed