Nondisjunction
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Example:
Imagine you're trying to fold a fitted sheet, but one corner just won't cooperate, leaving the sheet bunched up and uneven. This is a bit like what happens in nondisjunction, where chromosomes fail to properly separate during meiosis. Just as the unruly corner prevents the sheet from folding neatly, nondisjunction causes an unequal distribution of chromosomes, leading to genetic imbalances in the resulting cells.
Practice Version
Nondisjunction: The failure of chromosomes to separate during meiosis. Non-disjunction. It is when chromosomes don't separate properly, leading to cells with too many or too few chromosomes.