1. Get a learning target sheet from up front3/9 I can describe how growth and development are related to cell division, growth, and signaling I can describe how cells become specialized for specific functions

2. Agenda Ch 13 Notes 1 Short Video & Practice activity Finish Notes 1 Short video & Practice activity

3. CH 13 Notes #1 Growth & Development

4. Multicellular organisms are formed by cell growth, division, and differentiation

5. Sexual reproduction Fertilization: sperm and egg coming together

6. When sperm and egg come together they form a zygote

7. After fertilization, cell division starts

8. Embryo: organism once its made of more than one cell

9. Cell cycle Interphase (90% of the time): cell is not dividing G1 (cell gets bigger) S (DNA replication) G2 (More organelles made, getting ready to divide) Mitosis: cell division

10. New Cell Cell division (mitosis) Cell grows DNA replication Cell gets ready to divide

11. The cells keep dividing until they make a hollow ball called a blastula

12. Gastrulation: cells on the outside start to push in

13. Gastrula: hollow ball of cells when cells on the outside start to push inward

14. The outside cells start to form the nervous system (brain, nerves, spinal cord)

15. After the nervous system starts to form we call it a neurula

16. Gastrulation Animation http://www.youtube.com/watch?v=8v6cXkzlE QA http://www.youtube.com/watch?v=8v6cXkzlE QA

17. Foldable Label the organism in each of the stages we’ve talked about – Zygote – Embryo – Blastula – Gastrula – Neurula

18. Developmental stages quiz!

19. How do cells become specialized (get a specific job)?

20. Differentiation: cells becoming specialized (ready to perform a specific job)

21. Differentiation happens when cells send chemical signals to each other

22. If you move a cell it will become the same type of cell as its new “neighbors” because of these chemical signals Becomes a nerve cell Becomes a stomach cell Becomes a skin cell

23. Stem Cells Stem cells: cells that have not become specialized yet Scientists are interested in stem cells because they can be turned into many types of other cells

24. Uses of stem cells 1.Healing damaged tissues 2.Gene therapy 3.Drug research

25. Stem cell controversy One method of researching embryonic stem cells will kill the embryo BUT researchers are working to change this

26. A special case of development Metamorphosis: When an organism dramatically changes after birth

27. Video: Metamorphosis Examples Metamorphosis http://www.teachersdomain.org/asset/tdc02_ vid_metamorph/ http://www.teachersdomain.org/asset/tdc02_ vid_metamorph/