CELL DIVISION & CELL CYCLE. Ms.Tanyaratana Dumkua Biology Department, MahidolWittayanusorn School
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1 CELL DIVISION & CELL CYCLE Ms.Tanyaratana Dumkua Biology Department, MahidolWittayanusorn School
2 Why do cells divide?
3 Growth : make an organism larger and more complex Development : cell differentiation Decrease : small size cells Repair : tissues that were damaged Replace : lost/ broken down cells Reproduce : to make more cells or organisms
4 What is happening in divided cell?
5 Prokaryotic division & Eukaryotic division Differences Chromosome : shape Chromosome : number Nucleus Organelles
6 Time = 0 min Time = 18 Hour A Bacteria B C Which flask have increasing cells? Paramecium D
7 Binary Fission : Bacterial Reproduction Why do the new cells look similar?
8 Karyokinesis & Cytokinesis
9 1 Origin of Replication 1 Chromosome = 1n (Monoploid)
10 Binary Fission : Protists Reproduction Karyokinesis & Cytokinesis
11 Karyokinesis In nucleus : a linear chromosome with many origins of replication
12 Karyokinesis
13 How many chromosomes in one nucleus? Most are diploid (2n) but some are not.
14
15 Which kind of this cell? A. Monoploid (n = 6) B. Diploid (2n = 6) C. Triploid (3n = 6)
16 Which kind of this cell? A. Monoploid (n = 9) B. Diploid (2n = 9) C. Triploid (3n = 9)
17 Which kind of this cell? A. Monoploid (n = 6) B. Diploid (2n = 6) C. Triploid (3n = 6)
18 Please draw 3 cells in your paper, First one is monoploid (n = 4), another one is diploid (2n =8), the last one is tetraploid (4n =8).?
19 Eukaryotic cell has many linear chromosomes, so, the karyokinesis of eukaryote is quite different from prokaryote. Spindle fiber : microtubule : tubulin
20
21 Cell Cycle
22 MITOSIS Nucleolus Centrosome Nuclear membrane Spindle fiber Plasma membrane
23 Cell Cycle Cytokinesis Karyokinesis Interphase Mitotic phase
24 Interphase
25 Interphase
26 Prophase - Chromatin condenses into chromosome (chromosome packing) - Nucleolus disappear - Separation of centrosome - Formation of the mitotic spindle whitefish_blastula_.jpg
27 Prophase
28 Metaphase Chromosomes line up along metaphase plate or equatorial plate (imaginary plane) At late metaphase, centromere divides, preparing to separate chromatids whitefish_blastula_.jpg
29 Metaphase
30 Anaphase Chromosomes break at centromeres, and daughter chromosomes (1csister chromatids) move to opposite ends of the cell. whitefish_blastula_.jpg
31 Anaphase
32 Telophase & Cytokinesis - Nuclear membrane reforms, nucleoli reappear, chromosome unwind into chromatin - Myosin II and actin filament ring contact to cleavage cell in two. whitefish_blastula_.jpg
33 Telophase
34 Cytokinesis Cleavage furrow : microfilament Cell plate : pectin and cellulose
35 Please draw 2 cells, one is 2n=4 at metaphase and another one is 2n=6 at anaphase
36 Amount of DNA in cell cycle 2n=4
37 MEIOSIS
38 Stages of Meiosis Meiosis I Meiosis II
39 Meiosis I
40 Interphase of meiosis I
41 Prophase I
42 Metaphase I
43 Anaphase I
44 Telophase I
45 Meiosis II
46 Prophase II
47 Metaphase II
48 Anaphase II
49 Telophase II
50 Meiosis I
51 Meiosis II
52 Which stages of these cells? B A C D
53 Which stages of these cells? A B C D E
54 Gamete formation
55
56
57
58 Crossing over & Gene Segregation
59 Difference between mitosis and meiosis ttps://cdn.thinglink.me/api/image/ /1240/10/scaletowidth
60 Amount of DNA in Cell Cycle
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