Scrambling Eggs in Plastic Bottles

First, when it comes to reproducing, we humans are terribly inefficient. No less than 15%–20% of human conceptions end in miscarriage, and an astonishing 50% of these are chromosomally abnormal. (Compare this to the common fruit fly, whose eggs are chromosomally normal in more than 99.9% of cases.) Against that sort of background of meiotic failure, it may be difficult indeed to identify any environmental component that influences the rate of nondisjunction.