1. HW: IP: Mitosis & Meiosis *Signed Progress Report and Quiz: Friday!*
Tuesday
March 14, 2017
I can:
differentiate between mitosis and meiosis
explain how meiosis leads to diversity
Agenda
(10) Catalyst
(25) GN: Meiosis
(15) GP: Venn Diagram
(15) Kahoot!
(15) IP: Meiosis
(5) Exit Ticket
Catalyst
Write down your favorite color, food, or animal.
Complete the catalyst matching sheet and turn in!
HW: IP: Mitosis & Meiosis
*Signed Progress Report and Quiz: Friday!*

2. HW: Mitosis and Meiosis Tic Tac Toe Options
Wednesday
March 15, 2017
I can:
practice and understand the steps of mitosis and meiosis
Agenda
(10) Catalyst
(10) Video Review
(65) Group Work
Catalyst
1. What is one difference between mitosis and meiosis?
2. How many cells are made after one round of meiosis? Are they identical or unique?
3. How many cells are made after one round of mitosis? Are they identical or unique?
HW: Mitosis and Meiosis Tic Tac Toe Options

3. Exit Ticket Review
1. How many cells are produced at the end of meiosis? _____ 2. How many times do cells split in meiosis? _______ 3. What types of cell does meiosis produce? ___________________________ (gametes or somatic) 4. How do the number of chromosomes in the daughter cells compare to the original cells? __________________________ 4 2
gametes
Has HALF the number

4. Exit Ticket Review
5. Which describes why meiosis promotes genetic variability? A. Meiosis produces four gametes that have half the number of chromosomes of the parent cell. B. Meiosis produces four gametes that have twice the number of chromosomes of the parent cell. C. Meiosis produces four gametes that have the same number of chromosomes as the parent cell. D. Meiosis produces four gametes that have four times the number of chromosomes of the parent cell.

5. Exit Ticket Review
6. What is a result of crossing over during meiosis? A. genetic variation B. extra chromosome formed C. loss of chromosomes D. production of gametes

6. Exit Ticket Review
1. As a corn plant ages, its leaves grow. Which process is directly responsible for the growth of these leaves? A. the division of cells in the plant B. the release of oxygen from the plant C. the absorption of carbon dioxide in the stem D. the transportation of nutrients from the rooms

7. Exit Ticket Review
At the end of mitosis, how many daughter cells are produced? What is one purpose of mitosis? What happens during each stage of the cell cycle? G1 (growth 1) – S (synthesis) – G2 (growth 2) – 2
Growth & repair
Cells grow, make new organelles and proteins
DNA replication
Cell prepares for mitosis

8. Asexual Reproduction

9. Big Picture: What accounts for genetic variation in organisms?

10. Why do siblings look different from each other?

11. Why do siblings look different from each other?

12. Why do children look different form their parents?

13. Why do children look different form their parents?

14. Why do children look different form their parents?

15. genetic variation! intercourse
Sexual reproduction involves the contribution of genetic
material from two parents, and results in….
genetic variation!
intercourse

16. Turn and Talk
Why is sexual reproduction (and diversity) a good thing?

17. Human Chromosome Number
Human body cells contain 2 copies of each of 23 chromosomes.
1 copy comes from each parent
2 copies = diploid (2n)
copy from dad
copy from mom
Each set of chromosomes is homologous – they are the same size and contain the same information
chromosome 19

18. Human Chromosome Number
Human body cells contain 2 copies of each of 23 chromosomes.
1 copy comes from each parent
2 copies = diploid (2n)
copy from mom
copy from dad
Each set of chromosomes is homologous – they are the same size and contain the same information
After doubling during the S phase, the homologous chromosomes now form tetrads.
chromosome 19

19. Human Cell Type Somatic Cells Gametes body cells
diploid (2n) = 2 copies of 23 chromosomes
made by mitosis
egg and sperm
haploid (1n) = 1 copy of 23 chromosomes
made by meiosis

20. gametes Write On Your Board
What type of cell are egg and sperm? (gamete or somatic)
gametes

21. somatic cells Write On Your Board
What type of cell is a skin cell? (gamete or somatic)
somatic cells

22. haploid, 23 Write on Your Board
What type of cell is a gamete (diploid or haploid), and how many chromosomes does it contain?
haploid, 23

23. diploid, 46 Write on Your Board
What type of cell is a somatic cell (diploid or haploid), and how many chromosomes does it contain?
diploid, 46

24. somatic cells Write on Your Board
What kind of cell is made by mitosis?
somatic cells

25. Write on Your Board
What kind of cell is made by meiosis?
gametes

26. Just like mitosis, except…
Meiosis (aka reduction division) is the process in which gametes are made.
Just like mitosis, except…
each cell divides two times
each cell produces 4 daughter cells
cells produced are haploid, not diploid
each cell produced is different from the parent

27. There are many ways in which meiosis results in genetic variation, or different combinations of DNA.
1. Crossing-over
During prophase I of meiosis, homologous chromosomes pair up to form a tetrad. Chromatids then cross over each other, and the crossed sections are exchanged. This results in new combinations of genes (DNA).

28. 2. Random (or Independent) Assortment
There are many ways in which meiosis results in genetic variation, or different combinations of DNA.
2. Random (or Independent) Assortment
Chromosomes are separated into gametes randomly. That is why you inherit traits by chance, and you get a mix of traits from each parent.

29. There are many ways in which meiosis results in genetic variation, or different combinations of DNA.
3. Mutation
Sometimes there is a mistake in the DNA that is not caught.

30. There are many ways in which meiosis results in genetic variation, or different combinations of DNA.23 46 23
4. Sexual Reproduction
Reproduction that requires 2 parents results in variation because any combination of egg and sperm is possible. Fertilization (when an egg and sperm combine) restores the correct chromosome number.

31. There are many ways in which meiosis results in genetic variation, or different combinations of DNA.
5. Nondisjunction
Nondisjunction is when chromosomes don’t separate correctly in meiosis. It leads to the wrong number of chromosomes. It results in genetic disorders like Down Syndrome.

32. The genetic variation produced by meiosis ensures that there is a wide variety of traits in offspring.

34. Mitosis
Meiosis

35. Write on Your Board
Mitosis or meiosis:
produces 2 cells
mitosis

36. mitosis Write on Your Board
Mitosis or meiosis:
produces cells that are identical to the parent
mitosis

37. meiosis Write on Your Board
Mitosis or meiosis:
produces cells that are genetically different from the parent
meiosis

38. Write on Your Board
Mitosis or meiosis:
produces 4 cells
meiosis

39. mitosis Write on Your Board chromosome # is the same as parent
Mitosis or meiosis:
chromosome # is the same as parent
mitosis

40. meiosis Write on Your Board
Mitosis or meiosis:
has half as many chromosomes as parent cell
meiosis

41. meiosis Write on Your Board increases genetic diversity
Mitosis or meiosis:
increases genetic diversity
meiosis

42. meiosis Write on Your Board chromosome number is divided in half
Mitosis or meiosis:
chromosome number is divided in half
meiosis

43. Write on Your Board
Mitosis or meiosis:
results in clones
mitosis

44. Write on Your Board
Mitosis or meiosis:
crossing-over occurs
meiosis

45. Write on Your Board
Mitosis or meiosis:
asexual reproduction
mitosis

46. Write on Your Board
Mitosis or meiosis:
makes gametes
meiosis

47. meiosis Write on Your Board part of sexual reproduction
Mitosis or meiosis:
part of sexual reproduction
meiosis

48. Write on Your Board
Mitosis or meiosis:
makes somatic cells
mitosis

49. meiosis Write on Your Board
Mitosis or meiosis:
occurs in reproductive organs (ovaries, testes)
meiosis

50. mitosis Write on Your Board occurs in somatic cells
Mitosis or meiosis:
occurs in somatic cells
mitosis

51. different combinations of DNA (genes)
Write on Your Board
What does crossing-over result in?
different combinations
of DNA (genes)