2. Unit III Meiosis and Fertilization

5. You started as a cell smaller than a period at the end of a sentence…

6. How did you get from there to here?

7.  Going from egg to baby…. the original fertilized egg has to divide… and divide…

8.  One-celled organisms  for reproduction  asexual reproduction (clones)  Multi-celled organisms  for growth & development  from fertilized egg to adult  for repair & replacement  replace cells that die from normal wear & tear or from injury amoeba starfish

9.  What has to be copied  DNA  organelles  cell membrane  lots of other molecules ▪ enzymes animal cellplant cell

10. double-stranded human chromosomes ready for mitosis

11. 46 chromosomes 23 pairs

12. 46 chromosomes 23 pairs

13.  THINK ( 3 minutes)-> write 5 things  PAIR ( 2 minutes )-> share 2 things with your partner write what your partner said  SHARE ( 2 minutes)-> share 1 thing with the class write what the class shared

14. ip MAT C I.P.M.A.T.C.

15.  Stage 1: cell copies DNA nucleus cell DNA Copy DNA! (interphase)

16.  Stage 2: DNA winds into chromosomes  DNA is wound up into chromosomes to keep it organized nucleus cell duplicated chromosomes Wind up! (prophase)

17.  Stage 3: Chromosomes line up  chromosomes line up in middle  attached to protein “cables” that will help them move duplicated chromosomes lined up in middle of cell Line up! (metaphase)

18.  Stage 4: Chromosomes separate  chromosomes split, separating pairs  start moving to opposite ends chromosomes split & move to opposite ends Separate! (anaphase)

19.  Stage 5: Cell starts to divide  cells start to divide  nucleus forms again Divide! (telophase)

20.  Stage 6: DNA unwinds again  cells separate  now they can do their every day jobs Bye Bye! (cytokinesis)

21.  Get 2 exact copies of original cells  same DNA  “clones”

25. onion root tip

26. interphaseprophase metaphaseanaphasetelophase cytokinesis I.P.M.A.T.C. P lease M ake A nother T wo C ells