Cell Theory & Cell Division

1. All living things are made of cells Cell Theory 1. All living things are made of cells

Which of the following is made of cells? Rock Bacteria Fish Skin Glass Eyelashes Question 2: Which of these are made of atoms?

(they contain different parts with their own jobs) Cell Theory 2. Cells have structure (they contain different parts with their own jobs)

3. All cells come from other cells Cell Theory 3. All cells come from other cells

4. Cells contain DNA or genetic information Cell Theory 4. Cells contain DNA or genetic information

2 Types of Cells 1. Eukaryotic = Has a Nucleus 2. Prokaryotic = Has NO Nucleus

To help you remember… Pro = NO! Eu = YES!

How do Cells Divide?

Mitosis The process by which a nucleus divides into 2 identical “daughter” cells, each containing the same number & type of chromosomes as the parent cell

Mitosis Videos Cell Cycle & Cancer : http://youtu.be/lpAa4TWjHQ4 As you watch: Why is it important for your cells to divide? What are the 4 main parts of Mitosis?

Why is it important for cells to divide? Helps you grow Helps heal wounds Replaces old, worn out cells

Before a cell divides… Interphase 90% of cell life Cell is working, doing its job Towards the end, begins to make a copy of its DNA

Steps of Mitosis: PMAT 1. Prophase P = Prepare Cell makes a copy of DNA DNA condenses into chromosomes

Steps of Mitosis: PMAT 2. Metaphase M = Middle Nucleus “dissolves” Chromosomes line up in the middle of the cell

Steps of Mitosis: PMAT 3. Anaphase A = Away Chromosomes are pulled apart

Steps of Mitosis: PMAT 4. Telophase T = Two Twins Splits into two identical nuclei and cells

Identify the Steps of Mitosis A) B) Identify the Steps of Mitosis C) D)

B A D C

Meiosis The division of a parent cell twice to create four different daughter cells. They have half the number of chromosomes as the parent.

Meiosis- division of sex cells It is what makes you male or female PMAT x 2 then cytokenesis

Steps of Meiosis

Mitosis Meiosis One division Same number of Chromosomes Identical to Parent genetically 2 daughter cell produced Body Cells Two divisions Half number of chromosomes Different from parent genetically 4 daughter cells produced Sex cells (Gametes)

Mitosis/Meiosis You will draw and label each circle with the number of chromosomes shown in the circles below

Phases of Mitosis Phases of Meiosis Draw the phases: Prophase Metaphase Anaphase Telophase Draw the phases: Meiosis I: Meiosis II: Prophase I Prophase II Metaphase I Metaphase II Anaphase I Anaphase II Telophase I Telophase II

Binary Fission (watch video after you finish, link is on the last slide) The simple cell division in which one cell splits into two Allows for rapid reproduction Used by bacteria

Video clip https://www.youtube.com/watch?annotation_id=annotatio n_2659087401&feature=iv&src_vid=FODmSmG5z2Y&v=b RcjB11hDCU