BIO 320 Lecture Notes - Lecture 9: Dna Replication, Ubiquitin, Mdm2
Document Summary
G1: two daughter cells have just been formed. G1 phase is spent growing and re-establishing normal cell behavior. G2: a short gap before cell decides to undergo mitosis and divide. M: the cell elongates, chromosome pairs are aligned along the center of the cell and then evenly distributed to daughter cells (/each side of the one elongated cell), organelles duplicate and separate, one cell becomes two daughter cells (=cytokinesis) ** it is crucial that these phase occur in a very coordinated and controlled manner ( you don"t want to divide if you haven"t faithfully replicated your genome!). There are checkpoints in place to make sure one phase doesn"t start until the preceding is ready to finish. Once we pass this checkpoint, the cell will divide environmental signals will not affect cell fate after this checkpoint. Checkpoints are controlled by relative amounts of proteins within the cell.
