Science Starter How does an asexual organism reproduce? Name the three reasons that a cell divides. What is cellular division? Why is it important that we have cell division?

Agenda Test on Reproduction (7.L.2.1) on THURSDAY Notebook Check on THURSDAY Mitosis (Wednesday, Thursday, Friday) Meiosis (Monday, Tuesday) Agenda

CELL DIVISION…The two types Mitosis Meiosis Asexual Cell Division Creates 2 daughter cells that have the exact same DNA A cell with 46 chromosomes creates 2 cells with 46 chromosomes each Creates Somatic (Body) Cells Creates DIPLOID Cells Sexual Cell Division Used to create GAMETES (sex cells— Egg and Sperm) Creates 4 daughter cells that have half the amount of DNA A cell with 46 chromosomes creates 4 cells with 23 chromosomes each Creates Haploid Cells CELL DIVISION…The two types

What is mitosis? Mitosis is the process that divides the cell’s nucleus into two, each with a complete set of genetic material from the parent cell. 4 phases

Nucleus: Organelle that is the “command center” of the cell and contains all the genetic information Surrounded by a Nuclear Membrane Chromosome: threadlike structure that carries the genes (aka DNA) In the NUCLEUS Vocabulary Recap

Mitosis is used for…. CD is GRREAT!!! Remember the tool?

CD is GRReat! CD is Cell Division G is Growth R is Repair R is Reproduction CD is GRReat!

Interphase Cell is at rest. At the end of Interphase, cells grows in size and replicates (doubles) its DNA. Interphase

1. Prophase Chromosomes condense and the nuclear membrane disappears. Late Prophase Early Prophase 1. Prophase

Chromosomes line up in the center of the cell. 2. Metaphase

Chromosomes separate. Early Anaphase 3. Anaphase Late Anaphase

New nuclei form containing exact copies of the original cell’s DNA. 4. Telophase

The cell pinches in the middle and divides into two daughter cells. Cytokinesis

Quick Videos http://www.youtube.com/watch?v=rgLJrv oX_qo http://www.youtube.com/watch?v=VGV3f v-uZYI Quick Videos

Prophase Metaphase Anaphase Telophase ….Cytokinesis PMAT…C

What do you think? Mitosis is: Asexual Reproduction? OR Hint: Asexual--one cell makes two identical offspring Sexual--two cells make genetically different offspring What do you think?

A student will be bringing around science textbooks. Turn to page C83. You will also receive a foldable. Label the top flap, “STAGES of MITOSIS” Mitosis Foldable

Mitosis Foldables You will create five flaps to represent PMAT….C Use a pencil and two different colored markers from the bins. When you are done with the markers, please put them back in my box. Turn your foldables into me! I will return them. Mitosis Foldables

Exit Ticket Mitosis is the process that divides the cell’s nucleus into __________. A. 3 B. 2 C. 1 D. 4 List out the different stages of mitosis in correct order. Explain what happens in Anaphase.