mitosis - Cell reproduction requires a cell to divide into...

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Cell reproduction requires a cell to divide into 2 exact replicas. It has to re-organize its nucleus and cytoplasmic structure. Why do cells divide? Replacement of worn out or injured cells (repairing wounds, replacing skin post sun burn peels, liver damage d/t alcohol) Growth of the organism requires new cells Reproduction Mitosis is the process by which the body makes new cells for replacement or growth. (Meiosis is the procedure for reproduction). In Mitosis, the cell will 1 st double its DNA, then divide into 2 new cells, resulting in a complete set of genes (chromosomes) passed on to the daughter cells (new cells). Mitosis is divided into 5 stages: (Students follow along on pg. 29-lab manual) 1. Interphase: In between cycles. DNA is copying. Chromosomes (which are a threadlike structure in the cell’s nucleus made of DNA) must be replicated. Before interphase you have 1 copy of each chromosome, after replication you have 2 chromatids held together by a centromere. The 2 chromatids are still
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This note was uploaded on 09/07/2011 for the course BIO 101 taught by Professor Staff during the Spring '11 term at S.F. State.

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