01:447:380 Lecture 8: Cell Cycle, Mitosis and Meiosis
Document Summary
It took many rounds of replication and division to build your approx. In addition to replication/division making more cells, cells differentiate as they replicate. You have several hundred different types of tissues in your body. Your cells become more specialized with every cell division. In each cell type, a different subset of genes is turned on. The set of genes that gets turned on determines the set of proteins the cell possesses. The set of proteins the cell possesses determines the functions the cell can perform. G1: stockpile nucleotides, atp, enzymes to replicate dna. G2: synthesize microtubules and other proteins needed for cell division, stockpile atp and enzymes for mitosis/meiosis. The cell cycle may also include a g0 (g zero) phase. In g0, the cell stops replicating and dividing. A cell goes into g0 if it senses a lack of growth factors, nutrients or other molecules that are necessary for the cell cycle to continue.