X and Y

     X, you will remember, is the independent variable which determines the value of the dependent variable, Y.
     I’ve always wondered about their association. In every equation, Y is entirely reliant upon X. As X varies arbitrarily, Y follows. Y can be manipulated at a whim by a teeny variation of X. X is an unknown, so Y must also be unknown. Unknown and dependent:  what kind of gormless, clueless existence does Y lead?
     That’s just the mathematical application. In biology, the same relationship applies – but doubly so. This explains why two X chromosomes together are infinitely unknowable to a Y.