One of the most fiendishly difficult concepts--because of the way it's taught rather than what it is--in biology is meiosis. This is how germ cells produce gametes. It involves replication, reduction, and, most importantly CROSSOVER, such that at each stage of the process genes are mixed (as opposed to mitosis, which produces IDENTICAL daughter cells). I was gratified to hear a student say yesterday, with that AH-HA look on her face, that she finally got it! This is what teaching is all about!
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