1. September 5, 2017 www.biohs.weebly.com TO DO: Notebook, pencil/pen.
WARM UP: How do cells reproduce?
HOMEWORK:
Lab Report Due September 11th

2. Phases of the Cell Cycle
The cell cycle consists of
Interphase – normal cell activity
The mitotic phase – cell divsion
INTERPHASE
Growth
G 1
(DNA synthesis)
Growth G2
Cell Divsion

3. Functions of Cell Division
20 µm
100 µm
200 µm
(a) Reproduction. An amoeba, a single-celled eukaryote, is dividing into two cells. Each new cell will be an individual organism (LM).
(b) Growth and development This micrograph shows a sand dollar embryo shortly after the fertilized egg divided, forming two cells (LM).
(c) Tissue renewal. These dividing bone marrow cells (arrow) will give rise to new blood cells (LM).

4. Chromosomes A diploid cell has two sets of each of its chromosomes
A human has 46 chromosomes (2n = 46)
In a cell in which DNA synthesis has occurred all the chromosomes are duplicated and thus each consists of two identical sister chromatids
Maternal set of
chromosomes (n = 3)
Paternal set of
2n = 6
Two sister chromatids
of one replicated
chromosome
Two nonsister
chromatids in
a homologous pair
Pair of homologous
chromosomes
(one from each set)
Centromere

5. Phases of the Cell Cycle
Interphase
G1 - primary growth
S - genome replicated
G2 - secondary growth
M - mitosis
C - cytokinesis

6. 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

7. Interphase Plant Cell Animal Cell
Photographs from:

8. 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.
Spindle fibers form between the poles.
Centrioles
Sister chromatids
Spindle fibers

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

10. Metaphase 2nd step in Mitosis
Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers

11. Metaphase Plant Cell Animal Cell
Photographs from:

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

13. Anaphase Plant Cell Animal Cell
Photographs from:

14. Telophase 4th step in Mitosis
Two new nuclei form.
Chromosomes appear as chromatin (threads rather than rods).
Mitosis ends.
Nuclei
Nuclei
Chromatin

15. Telophase Plant Cell Animal Cell
Photographs from:

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

17. Animal Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             
Cytokinesis                                                             

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

19. Cell Cycle

20. - Cell Division
The Cell Cycle 20

21. Cell Division An integral part of the cell cycle
Results in genetically identical daughter cells
Cells duplicate their genetic material
Before they divide, ensuring that each daughter cell receives an exact copy of the genetic material, DNA

22. Vocabulary Go to your website and write this in your journal page.
Mitosis Vocabulary.
Dictionary definition
Your own definition
Write it in a sentence

23. Vocabulary Mitosis Vocab: Interphase: G1 phase, S phase, G2 phase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Chromosome
Chromatid
Centriole