detail of mitosis:
first cell has to copy its chromosomes in order for the two split cells to have he same number of chromosomes and same sets
- this is DNA replication (copy chromosomes)
- DNA replication - each chromosomes undergoes copying process. held together by centromere.
- they are now a 'pair of chromatids'
- takes place in the nucleus while it is still intact - interphase of the cell cycle
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