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As in anaphase in mitosis (and unlike anaphase I in meiosis), the fibers pull the chromatids apart and toward opposite ends of the cells. Though the genetic code of a human being is contained within 46 chromosomes, only half of this number exists within the cell of a sperm or egg.
Along with cytokinesis (the division of the rest of a cell), mitosis results in a parent cell dividing into two daughter cells.

If the cells didn't have half, a fertilized egg would contain 92 chromosomes and be untenable. Each of these cells will have only half the number of chromosomes, but each chromosome will contain genetic information from both parents.
Meiosis, a type of cell division specific to reproduction, avoids this by halving the number of chromosomes in a cell.

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