Haveouts Guided Notes Pen/pencil CAV Card Do First in Handout

Transcription

1 Haveouts Guided Notes Pen/pencil CAV Card Do First in Handout

2 Do First: Answer in your DFAD Answer the questions are in your Guided Notes, no DFAD this week. You have 4 mins.

3 Thursday, February 15 th is the LAST day to retake Quiz #14 Diffusion and Osmosis. Please come after school TODAY or during lunch on Wednesday. If you need to come during lunch you must ask me for a pass.

4 Explore: How do we get so many different cells? How many different cell types can we name?

5 Cell differentiation is the process by which stem cells become specialized. The body has many specialized cells, nerve cells, fat cells, blood cells, brain cells, and many more. That means they do many different jobs.

6 Stem cells divide through mitosis, just like all other somatic cells. (which are?) If mitosis make identical cells, how do cells they become different? The DNA does NOT change! The cells just express different genes (make different proteins).

7 All somatic cells have all of the SAME DNA (the light switches) Cell differentiation happens by only turning on certain DNA segments (like only turning on certain light switches)

8 This cell has ALL of the DNA, however, will turn into a liver cell because that portion of the DNA has been turned on! Think of a light switch turning off and on for certain cell types.

9 So now that we have these different cells, like skin cells. How do we get the different expression of skin color? What regulates the expression of that trait? Depending on those different combination of light switches we get different specialized cells.

10 The process by which these genes lead to the appearance in the phenotype (physical characteristic) is known as gene expression All cells in an organism contain the same DNA, but can differentiate into different types (specialize) by activating or inactivating different genes to control what proteins the cell produces.

11 Check For Understanding Are stem cells somatic cells or sex cells? What kind of cell division do they undergo? How do stem cells make different types of cells through mitosis?

12 Levels of Organization in the Body

13 Cells The basic unit of structure and function in living things. Examples- blood cells, nerve cells, bone cells, etc. Tissues Made up of cells that work together to perform a specific activity Examples - blood, nervous, bone, etc.

14 Organs Made up of tissues that work together to perform a specific activity Examples - heart, brain, skin, etc. Organ system Groups of two or more organs that work together to perform a specific function. Examples - circulatory system, nervous system, skeletal system, etc.

15 The 11 Body Systems 1. Nervous 2. Reproductive 3. Endocrine 4. Respiratory 5. Circulatory 6. Muscular 7. Skeletal 8. Digestive 9. Excretory 10.Integumentary 11.Immune Organism Entire living things that can carry out all the characteristics of life. Usually made up of organ systems, but an organism may be made up of only one cell such as bacteria or protist. Examples - bacteria, amoeba, mushroom, sunflower, human

16 Independent Practice Answer questions all question starting at Independent Practice Work must be done silently and independently. No Talking. If you have a question or request raise a silent hand and be patient. For independent practice, today we will be working silently and independently for 6 minutes.

17 Group Practice Review the questions answered during Independent practice. Go over each question. Each table member should explain why they selected their answer. Work must be done at a level ONE volume, which means I should not be able to hear you from my desk. Remain in your seat and only talk to people at your table. Make sure to keep conversations on topic. If you have a question or request raise a silent hand and be patient. For group practice, today we will be working for 10 minutes.