If your father was left-handed but your mother was right-handed, you have a 17% chance of being born left-handed, while two righties will have a left-handed child only 10% of the time.
Si tu padre es zurdo pero tu madre es diestra, tienes una posibilidad del  17% de haber nacido zurdo mientras que dos diestros tendrán un niño zurdo solo en 10% de los casos.