Warm-Up Explain the importance of DNA replication.
Yesterday s Picture 3B
original plus a daughter cell original cell
Hair follicle cells, for example.
Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 )
Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 ) Mitosis follows interphase to separate the DNA into two cells.
5 phases of mitosis: Nucleus breaks down and DNA condenses into chromosomes (prophase). Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 ) Mitosis follows interphase to separate the DNA into two cells. PRO
5 phases of mitosis: Nucleus breaks down and DNA condenses into chromosomes (prophase). Chromosomes line up in the middle (metaphase). Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 ) Mitosis follows interphase to separate the DNA into two cells. PRO META
Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 ) Mitosis follows interphase to separate the DNA into two cells. 5 phases of mitosis: Nucleus breaks down and DNA condenses into chromosomes (prophase). Chromosomes line up in the middle (metaphase). Chromosomes pull apart (anaphase). PRO META ANA
Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 ) Mitosis follows interphase to separate the DNA into two cells. 5 phases of mitosis: Nucleus breaks down and DNA condenses into chromosomes (prophase). Chromosomes line up in the middle (metaphase). Chromosomes pull apart (anaphase). Nuclei reform (telophase). PRO META ANA TELO
Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 ) Mitosis follows interphase to separate the DNA into two cells. 5 phases of mitosis: Nucleus breaks down and DNA condenses into chromosomes (prophase). Chromosomes line up in the middle (metaphase). Chromosomes pull apart (anaphase). Nuclei reform (telophase). Cells physically pinch apart from each other (cytokinesis). PRO META ANA TELO CYTO
Interphase is the longest stage, consisting of: Growth (G 1 ) DNA replication (S) Preparation for mitosis (G 2 ) Mitosis follows interphase to separate the DNA into two cells. 5 phases of mitosis: Nucleus breaks down and DNA condenses into chromosomes (prophase). Chromosomes line up in the middle (metaphase). Chromosomes pull apart (anaphase). Nuclei reform (telophase). Cells physically pinch apart from each other (cytokinesis). PRO META ANA TELO CYTO P M A T, C!
In summary 4n 2n 2n 4n 2n
Guided Practice Draw a graph of DNA content in a cell dividing over four generations and label growth, synthesis and preparation stages of interphase; mitosis; and cytokinesis (LO 3.8) Draw a graph of DNA content in a cell dividing over time with an increased cell cycle rate or decreased cell cycle rate (LO 3.7)
CTQ #1 Describe how a graph of DNA levels per cell would look over four generations. (LO 3.8) CTQ #2 Predict the amount of DNA present in a cell after 3 cycles of the cell cycle if it lost the ability to undergo cytokinesis. (LO 3.7)
Closure Epithelial skin cells are some of the fastest-dividing cells in the human body, which means that they complete and reenter the cell cycle more quickly than most other cell types. Predict what would happen if a person was scratched on the arm, killing approximately 10,000 cells from the surface of that person s skin, and justify your answer. (LO 3.7)