Any case where trisomy occurred due to fault of egg
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The type of error is called nondisjunction (pronounced non-dis-JUHNGK-shuhn). Usually when one cell divides in two, pairs of chromosomes are split so that one of the pair goes to one cell, and the other from the pair goes to the other cell. In nondisjunction, something goes wrong and both chromosomes from one pair go into one cell and no chromosomes for that pair go into the other cell.
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