BIO120H1 Lecture : Notes taken during lecture

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: Jean Jiang Nash

Document Summary

cell divides into two identical daughter cells. need to segregate components equally between the daughter cells: precisely, many control mechanisms are to ensure precisely equal distribution of chromosomes, many cancers have wrong number or pieces of chromosome, essential step. g1 = gap phase number 1: living and growing and duplicating its mitochdonria, growing in size. s phase: synthesizes dna chromosomes replicate. g2 phase: continues growing until double in size, doubled everything. mitosis: nuclear division followed by cytosolic division, end with two equivalent daughter cells. steps must be in order and controlled: questions and answers come in molecular switches molecules phosphorylated, ubinquinated, etc, decisions made at special times in cycle called cell cycle checkpoints. s-phase once enter s-phase, it"s committed can pause but must divide, otherwise undergo programmed cell death. at any point, cell can wait or go. cylin d with cdk4 will drive past g1-cdk point.