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n number refers to number of chromosomes. As you know, one set of your chromosomes come from mom and one set from dad. This is the 2n condition. This condition is maintained in mitosis, as all chromosomes double and two daughter cells are formed having the complete 23 pairs, 46 chromosomes of the 2n condition. Meiosis, which means ' halving ', doubles all chromosomes which are from dad to dad and mom to mom sister chromatids. These cross over genetic material with each other and the mom to mom set and the dad to dad set are pulled to opposite poles and two daughter cells are formed. Now, phase two of meiosis begins and the pairs in each daughter cell are pulled to opposite poles and you end up with four cell with 23 chromosomes apiece in them. This is the n condition.

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