Bellwork: Describe how the independent and dependent variable are related What is the difference between a theory and a law What are the parts of the scientific method?

After the test – New topic – Cell Division Put your test and answer sheet upside down in the corner of your desk, I will come and get it. Read the article and take Cornell notes : Questions to answer in your notes (put these in the margin) What is mitosis? What are 3 reasons for cells to undergo mitosis? What are chromosomes, and how many are in each new cell compared to the parent cell? What happens in each of the 3 stages of mitosis? Summary – at the bottom of your notes, explain: What might happen if a new cell did not have the same number of chromosomes as a parent cell A human cell has 46 chromosomes. How many would it have after mitosis?

Bellwork 9/16 – copy the following definitions into your notes after the cornell notes you took Friday - Unicellular – an organism made up of only 1 cell Multicellular – organisms made up of more than one cell Asexual reproduction – reproduction that produces 1 or more organisms identical to itself Sexual reproduction – when 2 parents contribute a sex cell to the new organism Cell cycle – 3 steps in a cells life cycle Mitosis – the part of the cell cycle where The nucleus divides

Bellwork 9/17 Draw an animal or plant cell. Label as many parts as you can remember.

Bellwork – 9/18 Look at the following photos. Describe possible reasons for the cell division that is taking place. Paramecium B. starfish C. Skin cell division D. Human

Unit 2: Life Science – Cell Division EQ: What are the parts of the cell cycle Obj: I can describe the cell cycle because I can draw and label the parts

Why do cells divide?

Why do cells divide? 1. Reproduction In unicelluar organisms it is a form of asexual reproduction (one parent organism) produces 2 identical offspring The original cell is called the parent cell and the new cells are called daughter cells

2. Growth In multicellular organisms produces new cells for growth EX/ Humans start as one cell that rapidly divides.

3. Replacement , replaces old or worn out cells EX/ skin cells are constantly dividing and being replaced.

4. Repair For repairing damage examples break bones - Starfish loses a limb ** not all damage can be repaired through cell division

What are the phases of the cell cycle? Interphase – the cell grows and copies the DNA Mitosis – when the cell nucleus divide Cytokinesis – the cytoplasm divides

What happens to the genetic material (DNA) during cell division? DNA - a molecule that contains information from parents that determines traits instructions for growth, development, and cell activities

What happens in Interphase part of the cell cycle? 1. Cell growth and duplication of organelles DNA in the chromatin (loose strands of DNA in the nucleus) is copied and coils and becomes a chromosome – visible DNA

What is Mitosis? the contents of the nucleus divide forms two identical daughter cells PMAT

Name the 3 phases of the cell cycle

On the back of your notes sheet On the back of your notes sheet. Draw and describe what happens in the phases of mitosis

Thurs. Bellwork What are the 3 phases of the cell cycle? What is the black mass in the beginning of the figure at right What is the orange x in the figure at right? What part of the cell cycle are the figures in? What phase of mitosis is shown at right? Describe what things are happening in this cell.

EQ: What are the parts of the cell cycle Obj: I know I can describe the cell cycle because I can order and label the phases.

Mitosis – 1. Prophase

2. Metaphase

3. Anaphase

4. Telophase Telophase

http://www.youtube.com/watch?v=AhgRhXl7w_g http://www.youtube.com/watch?v=AhgRhXl7w_g

Label the following phases of mitosis/cell cycle Review foldable info

Determine the phase of the cell cycle for a - e

Mitosis Mini Poster assignment. Don’t forget to put your name and period on the back of the poster. Cut out the scrambled pictures of the cell cycle and the labels. Place the pictures showing Interphase, the phases of mitosis and cytokinesis in the correct order on your colored piece of paper. When you are sure you have them in the right order, glue them in place and color and label a chromosome, chromatin, and chromatid and centromere

Friday bellwork: Identify the following phases of the cell cycle