AP Bio: Friday, 3/2/12 Cell Cycle & Mitosis Homework: Work on PS 14 Do Now: Take out your Mitosis worksheet Get back your test and look it over Today’s Goals: Describe the purpose and steps of the cell cycle Describe the anatomy of a chromosome and explain how it changes during the cell cycle Agenda: Review Test 8
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Homework: Work on PS 14 Do Now: Take out your Mitosis worksheet Get back your test and look it over Today’s Goals: Describe the purpose and.
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AP Bio: Friday, 3/2/12Cell Cycle & Mitosis
Homework: Work on PS 14
Do Now: Take out your Mitosis worksheet Get back your test and look it over
Today’s Goals: Describe the purpose and steps of the cell cycle Describe the anatomy of a chromosome and explain
how it changes during the cell cycle Agenda:
Review Test 8 Lecture/Discussion: Cell Cycle & Mitosis
Cell Cycle & MitosisAP Biology - 3/1/11
The Cell Cycle: Overview
One cell grows and divides into two new cells
Purpose: Growth Replace dead cells Repair tissues after
injury Asexual
reproduction (in single-celled organisms)
Amoeba reproducing
Animation of the Cell Cycle:
• Stages of Mitosis Video: Mitosis.mpg
Major Steps of the Cell Cycle
Interphase: growth; copying of chromosomes & organelles G1 phase: Cell grows S phase: DNA replicates G2 phase: More growth;
cell prepares to divide
Mitosis: Chromosomes separate to form two new nuclei
Cytokinesis: Cell splits to form two new identical cells
What do you notice about the chromosomes in G1 versus G2?
Chromosome Replication During the Cell Cycle
G1 Phase: Chromosomes are un-
replicated - each contains one copy of its DNA
G2 Phase: Chromosomes are
replicated - each contains two exact copies of its DNA
Un-Replicated Chromosome
Centromere – a small spot in the center of a chromosome
Replicated Chromosome
Sister Chromatids– two halves of a replicated chromosome– exact copies of each other