1. Mitosis and Meiosis

2. What is this a picture of?
1 2 3
4 5 6

3. Mitosis Notes
 Mitosis is when a cell separates the chromosomes in its nucleus
to make two identical cell copies

4. Cell Division Cycle (Cell Cycle)
Periods of the Cell Cycle:
1. Interphase: when cell grows and
duplicates DNA
a. G1(gap or growth phase): cell
prepares to replicate
chromosomes
b. S (Synthesis) phase: DNA synthesis
or replication occurs
c. G2 (gap or growth phase): cell
prepares for mitosis by making
microtubules to pull apart
chromosomes
2. Mitosis: chromosome separates
3. Cytokinesis: cell forms a cleavage
furrow and divides into two identical
cells

5. Importance of Mitosis
 1. Growth – cells divide to help you grow 
 2. Repair and Renewal – need cells to divide to heal wounds
and replace old dead cells
 3. Reproduction- organisms that reproduce asexually use mitosis
to make new organisms
 Usually spores
 Different from bacterial reproduction

6. Mitosis Picture Sort
Directions:
1. Put the pictures of mitosis in the correct order.
2. Match the picture with the name of each step of mitosis
3. Match the description with picture and name of each step of
mitosis
4. Finally, paraphrase description and copy onto notes

8. Hello!
Hi gang!
I have completely lost my voice. But, don’t worry. We will still
have lessons today. Yay! I will need your full attention today. I
will also need all of you to help each other and make sure
everyone is on task. Warm up is on the white board. Here is our
agenda:
1. Meiosis Notes
2. Peer Review Introduction (Make sure you have a hard copy
of your introduction with you)
3. Reading Packet – Annotations and 1 Page PD due

9. Meiosis Notes
Make sure you have a copy of the meiosis notes!
Today, we will be doing notes a little differently. First, we will
do our usual note taking. Then, we’re going to watch a
video on meiosis and I will take notes with you as we watch
the video. Feel free to let me know if you want to pause or
have any questions.

10. Meiosis
Meiosis is how sex cells (sperm and eggs) are made from germ
cells
Overview of Meiosis Video-
http://www.youtube.com/watch?v=D1_-mQS_FZ0
Meiosis Video (http://www.youtube.com/watch?v=ijLc52LmFQg)
– Remember, I will be taking down notes with you on the white
board. Get markers if you need. There are a lot of parts to it.
I also need someone near the laptop to help me pause the
* video. Thanks!

11. Draw Something – Mitosis and Meiosis
Review
 SOMEONE READ THE INSTRUCTIONS BELOW
 Take out your genetics, mitosis, meiosis notes
 One person will randomly be selected to be the drawer.
 Quanina will provide the drawer with the word you need to
draw on the white board and the category to the class. The
drawer may not give hints on the board
 After the drawer is finished with the drawing, people can shout
out potential answers. If the person gets it correct, the person
who answered correctly can choose another drawer. If the
person does not answer correctly, the drawer can change his
drawing or wait
 Playing for Points (participaton pts for ppl who participate :-)

12. Peer Review Introduction Papers
 Swap your introduction paper with at least 3 people
 Write annotated by: Your Name on the top front page
before you review the paper
 Check for Technicalities, Completeness, or Cohesiveness in
 Technicalities: grammar errors, spelling, sentence structures, etc
 Completeness: does it have all of the required elements
(check introduction handout and make sure it includes
everything asked for)
 Cohesiveness: Do the paragraphs connect the main idea of
the introduction? Are there parts of the text that are
unnecessary?

13. Peer Review Introduction Papers
When you are done, show me your paper for a final look
over and you can start revising it or working on your reading
packet
Reading Packet Due Wednesday April 18
Final Draft of Introduction Due Friday April 20

14. BEFORE YOU LEAVE (11:07a)
Reading Packet Due Wednesday April 18
Final Draft of Introduction Due Friday April 20th
Before you leave make sure I see you paper with the names
of the 3 graders for credit!

15. Meiosis I
Interphase 1:
 Chromosomes replicate (S phase)
 Cell grows and prepares for Meiosis I (G1 and G2)
 Centrosomes (proteins that pull apart DNA) replicate

16. Meiosis I
Prophase I:
 Homologous chromosomes find each other and form Tetrads
 Crossing over occurs between non-sister chromatids
 Crossing over: parts of the DNA switches between non-sister
chromatids
 Spindles attach Chromosomes
see white board

17. Meiosis I
Metaphase I
 Tetrad (pairs of homologous chromosomes)lines up on the
metaphase plate
 Homologous chromosomes line up in a random order.

18. Meiosis I
Anaphase I
 Homologous chromosomes get pulled toward the poles (where
centrosomes are)

19. Meiosis I
Telophase I and Cytokinesis
 Cleavage furrow forms and cell divides into 2 cells
 Each cell has one copy of two sister chromatids

20. Differences between Meiosis I and
Mitosis
 Homologous chromosomes find each other and form Tetrads in
Meiosis but not Mitosis
 Crossing over occurs between non-sister chromatids in Meiosis
but not Mitosis
 Homologous chromosomes line up in a random order in Meiosis
but not Mitosis

21. Video Recap

22. Meiosis II
 Prophase II
 Chromosomes are in pairs (diads)
 Spindle forms

23. Meiosis II
 Metaphase II
 Chromosomes line up on the metaphase plate
 Kinetochores of sister chromatids are attached to microtubules that
link to the poles

24. Meiosis II
 Anaphase II
 Sister chromatids separate and move to opposite poles

25. Meiosis II
 Telophase II and Cytokinesis
 Nuclei(nucleus) forms and chromosomes decondense
 Four haploid daughter cells are produced
 We can now make babies!

26. Meiosis
Mitosis