Heredity or Environment?

Why are parents always having a fit when their kids are taking exams here? Does seeing your parents agitated, applying martial discipline and experiencing beyond the pale anxiety, stimulate the learning and retention centers? How about getting a life yourself, rather than trying to co-opt that of your child?

As the "joke" goes, the parent berates the child for his terrible report card. The child says, without missing a beat, "Gee Dad, do you think it was heredity or environment?"