1. EQ: How do the cells in your body reproduce?
Mitosis and Meiosis
EQ: How do the cells
in your body reproduce?

5. What is cell division?
Cells divide to grow, so they make copies of themselves.

7. Chromosomes
Bundles of genetic information made up of DNA

10. Trisomy 21 Down’s Syndrome

11. Trisomy 21

12. Trisomy 18 Edward’s Syndrome

13. Trisomy 18

14. Mitosis The process by which cells divide and makes copies of itself
Four stages:
IPMAT
Interphase, Prophase, Metaphase, Anaphase, Telephase

15. Mitosis Is needed for new:
Skin cells, hair cells, repairing cuts and injuries

17. Cytokinesis
It physically splits one cell into two by “squeezing” the membrane

18. Diploid- 2 sets of chromosomes (2n) Haploid- 1 set of chromosomes (n)
1 from mom, 1 from dad
Haploid- 1 set of chromosomes (n)

19. Meiosis Division of Sex cells. Reason for genetic diversity 2 Stages:
Meiosis 1: IPMAT l
Meiosis 2: IPMAT ll

20. Meiosis 1
Same as Mitosis
Start with 1 Diploid cell

21. Meiosis 2 End with 4 Haploid daughter cells
One of those becomes a sperm or egg.

22. Zygote: Fertilized egg
Gamete: Reproductive cell (sex cell) that contains the haploid set (n)
Sperm or egg

23. Homologous: Two sets of chromosome, one from male and one from female.
Crossing Over: A process occurring during meiosis where two chromosomes pair up and exchange segments of theirgenetic material.

24. Why Genetic Diversity?

26. Crossing Over Chromosomes wrap around tightly and exchange DNA
Results in Genetic Diversity

27. Comparison of Mitosis and Meiosis
Mitosis occurs in all cells of the _____ except _____________.
Meiosis only occurs in the formation of _____________.
body
egg and sperm
egg and sperm

28. Comparison of Mitosis and Meiosis
In meiosis, each _______ cell divides ______ to produce a total of ___ cells.
In mitosis each _______ cell divides _____ to form ___ cells.
diploid
twice 4
diploid
once 2

29. Comparison of Mitosis and Meiosis
In meiosis, each of the four cells contains _____ the number of chromosomes as the parent cell.
In mitosis, each new cell contains the ______ number of chromosomes as the original cell.
half
same

30. Comparison of Mitosis and Meiosis
In mitosis, the homologous pairs do not come together to form _______.
In meiosis, the homologous pairs do come together to form _______. While the chromosomes are in tetrads, _____________ may occur. There will be no crossing over in _______.
tetrads
tetrads
crossing over
mitosis

31. Comparison of Mitosis and Meiosis
In meiosis, the four haploid cells contain ________ combinations of chromosomes from each other.
In mitosis, the new cells contain ________ copies.
different
identical

32. LEFT SIDE ACTIVITY Draw the label the stages of Mitosis
Draw and label the stages of Meiosis