BIOL 1001 Lecture Notes - Lecture 9: G2 Phase, Decay Product, S Phase
Document Summary
Chapter 9 part 2 of 3 (begin material for exam 3) During interphase a cell grows, replicates its dna, and often differintiates. Most eukaryotic cells spend the majority of their time in interphase. Ex: human skin cells replicate about once a day, spend about 22 h in interphase. Interphase contains three phases - g1, s, g2. During g1 the cell: almost always grows in size, often differentiates. Decides whether or not to divide based on signals. If signals cause the cell to divide then the cell enters s phase. Once the cell enters s phase it is committed to dividing, there is no turning back! During s phase the cell replicates its dna. After s phase the cell enters g2 phase: more growth, synthesis of proteins necessary to divide. There are two types of cell division: mitotic cell division, meiotic cell division. Gives each daughter nucleus one copy of the parent cells replicated chromosomes: cytokinesis_ cytoplasmic division.
