1. 4.2 Overview of Photosynthesis Set up Cornell Notes on pg. 61 Topic: 5.2 Mitosis and Cytokinesis Essential Question: 1. Explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell? 2.1 Atoms, Ions, and Molecules 5.2 Mitosis and Cytokinesis 1. Explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell? Key concept: Cells divide during mitosis and cytokinesis

2. 5.2 Mitosis and Cytokinesis KEY CONCEPT Cells divide during mitosis and cytokinesis.

3. 5.2 Mitosis and Cytokinesis Cells must receive a full set of DNA (no more, no less) to work properly

4. 5.2 Mitosis and Cytokinesis DNA- double stranded molecule made of four different subunits of nucleotides (A,T,C,G) Chromosome- one long continuous thread of DNA –Each body cell has 46 chromosomes in 23 pairs

5. 5.2 Mitosis and Cytokinesis Chromosomes condense at the start of mitosis. DNA wraps around proteins (histones) that condense it. DNA double helix DNA and histones Chromatin Supercoiled DNA

6. 5.2 Mitosis and Cytokinesis One half of a duplicated chromosome is a chromatid. Sister chromatids are held together at the centromere. Telomeres protect DNA and do not include genes. Old DNA New DNA Pg. 60

7. 5.2 Mitosis and Cytokinesis Centromere Chromosome Telomere Sister Chromatid

8. 5.2 Mitosis and Cytokinesis Process of Meiosis Video

9. 5.2 Mitosis and Cytokinesis Classwork On the provided paper: –Please create a flow map of The Cell Cycle TITLE of Phase PICTURE (with color) Description of what is happening (in bullets) Pg. 140-141 in book Please include: Interphase Prophase Metaphase Anaphase Telophase Cytokinesis mitosis

10. 5.2 Mitosis and Cytokinesis Parent cell centrioles spindle fibers centrosome nucleus with DNA Interphase prepares the cell to divide (G1, S, G2) –During interphase, the DNA is duplicated. *Not part of mitosis

11. 5.2 Mitosis and Cytokinesis Mitosis divides a Somatic (body) cell’s nucleus in four phases. –Prophase: chromosomes condense and spindle fibers form.

12. 5.2 Mitosis and Cytokinesis –Metaphase: chromosomes line up in the middle of the cell.

13. 5.2 Mitosis and Cytokinesis –Anaphase: sister chromatids separate to opposite sides of the cell.

14. 5.2 Mitosis and Cytokinesis –Telophase: the new nuclei form and chromosomes begin to uncoil.

15. 5.2 Mitosis and Cytokinesis Cytokinesis differs in animal and plant cells. –In animal cells, the membrane pinches closed. –In plant cells, a cell plate forms.

16. 5.2 Mitosis and Cytokinesis How can you remember what goes first? Peter Made A Tiger Cry

17. 5.2 Mitosis and Cytokinesis Mitosis and Cytokinesis Video (9m37-21m)

18. 5.2 Mitosis and Cytokinesis Tip to Remember Mitosis = Mi “TOE” sis –A toe is part of your body –MITOSIS only occurs in your Somatic or BODY cells -Every cell EXCEPT sperm and eggs

19. 5.2 Mitosis and Cytokinesis Cell Cycle Poster Activity Please draw and explain the part that your group was assigned. Be prepared to share out with the class. Cell Cycle (5.1) Interphase Prophase Metaphase Anaphase Telophase Cytokinesis TOPIC PICTURE Explanation

20. 5.3 Regulation of the Cell Cycle Briefly explain why the daughter cells resulting from mitosis are genetically identical to each other and to the original cell.

21. 5.3 Regulation of the Cell Cycle During Interphase the original cell is preparing for cell division by duplicating (copying) its DNA. During mitosis the chromosomes are split, resulting in 2 nuclei with identical DNA. During cytokinesis the cell fully separates leaving us with two identical daughter cells.

22. 5.3 Regulation of the Cell Cycle Interphase: (G1, S, G2)

23. 6.1 Chromosomes and Meiosis Sponge 1: Please correctly identify the phase of mitosis. 1 2 34

24. 6.1 Chromosomes and Meiosis Sponge 1: Please correctly identify the phase of mitosis. Telophase Anaphase Metaphase Prophase