User blog comment:CrystalNeonSummerSnow/A New Direction... For Now, Of Course/@comment-1874924-20110715033309

A real-life basis for a rare genetic trait would probably go something like this: TK is a recessive gene; so if you get it from one parent, you're a carrier but have no symptoms. If both parents have it, then the chance of the child having (or, more likely, eventually developing) actual telekinesis is 25% per pregnancy. Thus, if two TK carriers have three children together, the chance of at least one of those children being telekinetic is roughly 2 in 3. (1 - (0.75x0.75x0.75)).