 Do Now: Why do cells need to divide?  Vocabulary: binary fission, budding, regeneration, mitosis  New York Times Article Summaries due Tomorrow  Read page Answer S.A. Page 249 #2, 3, 4, 6 due on Monday  Quiz on Cell Cycle and Mitosis on Monday  Read pages Answer S.A. Page 252 #1-5 due Wednesday  Scrapbook due Wednesday!

 Larger cell places demands on DNA that it cannot fulfill  Ex: Large town; small library  Larger cell is unable to keep up with the intake of nutrients and the release of waste products  Ex: Two way street for a busy town cause traffic build up if the street is not enlarged

 Cell cycle is how the cell grows, prepares for division, divides into two new daughter cells and then they each repeat the cycle again  What happens in phase G1? Cell has a growth spurt and increases in size while synthesizing new proteins and organelles  What happens in phase S? Replication of genetic material  What happens in phase G2? Organelles and molecules needed for cell division are made  What happens in the M Phase? Mitosis (cell division) takes place. Two identical cells with the same genetic information as parent cell are produced

 Do Now: What are the stages of the cell cycle? Why must a cell replicate its DNA before it can divide?  QUIZ HAS BEEN CANCELLED!  Hand in New York Times Article Summaries  Read page Answer S.A. Page 249 #2, 3, 4, 6 due on Monday  Read pages Answer S.A. Page 252 #1-5 due Wednesday  Scrapbook due Wednesday!

M phase G1 S G2 Sketch this diagram in your notebook.

 (I) Play My Accordion Terribly  Interphase (not really a phase of mitosis)  Prophase  Metaphase  Anaphase  Telophase

Centrioles Chromatin Interphase Nuclear envelope Cytokinesis Nuclear envelope reforming Telophase Anaphase Individual chromosomes Metaphase Centriole Spindle Centriole Chromosomes (paired chromatids) Prophase Centromere Spindle forming Section 10-2 Go to Section:

Centrioles Chromatin Interphase Nuclear envelope Cytokinesis Nuclear envelope reforming Telophase Anaphase Individual chromosomes Metaphase Centriole Spindle Centriole Chromosomes (paired chromatids) Prophase Centromere Spindle forming Section 10-2 Go to Section:

Centrioles Chromatin Interphase Nuclear envelope Cytokinesis Nuclear envelope reforming Telophase Anaphase Individual chromosomes Metaphase Centriole Spindle Centriole Chromosomes (paired chromatids) Prophase Centromere Spindle forming Section 10-2 Go to Section:

Centrioles Chromatin Interphase Nuclear envelope Cytokinesis Nuclear envelope reforming Telophase Anaphase Individual chromosomes Metaphase Centriole Spindle Centriole Chromosomes (paired chromatids) Prophase Centromere Spindle forming Section 10-2 Go to Section:

Centrioles Chromatin Interphase Nuclear envelope Cytokinesis Nuclear envelope reforming Telophase Anaphase Individual chromosomes Metaphase Centriole Spindle Centriole Chromosomes (paired chromatids) Prophase Centromere Spindle forming Section 10-2 Go to Section:



 How is mitosis different in plant cells than in animal cells?  There are 2 differences!!

 Why is cell division necessary?  Why must it be controlled?

Go to Section: Contact Inhibition: Cells normally stop multiplying when they come in contact with other cells. This is mediated by cell cycle genes. Cells with mutated cell cycle genes continue to multiply, even when other cells are in close contact.