1. Asexual Reproduction Mitosis
DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?
Mr. Buchman
7th Grade Life Science 1

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Begin!

3. 4:00
DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

4. 3:00
DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

5. 2:00
DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

6. 1:00
DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

7. TIME’s UP!

8. Asexual Reproduction Mitosis
DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals? 8

9. Vocabulary Needed
Chromosomes- structures in the nucleus that contain DNA
DNA-deoxyribonucleic acid, is the master copy of an organism’s information code.
Chromatin- hereditary material in a cell’s nucleus, it coils into the form of chromosomes when a cell divides
Centromere-where the double stranded chromosome is held together

10. How do little elephants grow up to be BIG elephants?

11. Why do animals shed their skin?

12. The process of asexual reproduction begins after a sperm fertilizes an egg.

13. Three reasons why cells reproduce by asexual reproduction: 1. Growth 2
Three reasons why cells reproduce by asexual reproduction: Growth Repair Replacement
Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.
Cell that reproduce by asexual reproduction reproduce constantly.

14. Animated Mitosis Cycle
Interphase
Prophase
Metaphase
Anaphase
Telophase & Cytokinesis

15. Interphase occurs before mitosis begins
Chromosomes are copied (# doubles)
Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase
CELL MEMBRANE
Nucleus
Cytoplasm

16. Interphase Plant Cell Animal Cell
Photographs from:

17. Prophase 1st step in Mitosis
Mitosis begins (cell begins to divide)
Centrioles (or poles) appear and begin to move to opposite end of the cell. (Only in animal cells).
Chromosomes become fully visible.
The nuclear membrane disappear
Spindle fibers form between the poles.(Only in plants).
Centrioles
Sister chromatids
Spindle fibers

18. Prophase Plant Cell Animal Cell Spindle fibers Centrioles
Photographs from:

19. Metaphase 2nd step in Mitosis
Chromatids (or pairs of chromosomes) attach to the spindle fibers and line up across the center of the cell.
Centrioles
Spindle fibers

20. Metaphase Plant Cell Animal Cell
Photographs from:

21. Anaphase 3rd step in Mitosis
Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers

22. Anaphase Plant Cell Animal Cell
Photographs from:

23. Telophase 4th step in Mitosis
Two new nuclei form.
Chromosomes appear as chromatin (threads rather than rods) and become harder to see.
Centrioles and spindle fibers start to disappear.
A nuclear membrane starts to form around each group of chromosomes.
Mitosis ends.
Nuclei
Nuclei
Chromatin

24. Telophase Plant Cell Animal Cell
Photographs from:

25. Cytokinesis occurs after mitosis
Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

26. Animal Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

27. Plant Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             
Cytokinesis
                                                            

28. Cell Cycle

29. - Cell Division
The Cell Cycle 30

30. Mitosis Animation