Page 56 Page 56 Page 56 Comparing Cell Cycles The table below compares the length of different cell cycles What Are the Functions of Cell Division Read the My Planet Diary Cycling Onp 56 ID: 1042299
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1. Cell DivisionChapter 2, Lesson 3Page 56Page 56Page 56
2. Comparing Cell CyclesThe table below compares the length of different cell cycles.What Are the Functions of Cell Division?Read the “My Planet Diary: Cycling On”…p. 56
3. What are the Functions of Cell Division?Use the data table to help answer the following questions:1. Which type of cell completes a cell cycle fastest?Frog egg cells2. With each cell cycle, two cells form from one cell. In three hours, how many cells could form from one frog egg cell? 64 cells
4. See Figure 1, page 57.Label each photo as: (A) growth(B) repair, or(C) reproductionAnswers: A = plant shoot GROWING B = Arm scrape healing C = Cougar with babies - reproduction
5. What Are the Functions of Cell Division?Cell division allows organisms to:GROWREPAIR damaged structuresREPRODUCE
6. What Happens During the Cell Cycle?During the Cell Cycle, a cell grows, prepares for division, and divides into two new cells, which are called “daughter cells.”
7. 3 stages of the cell cycleThe cell cycle consists of three stages:InterphaseMitosisCytokinesis“I ‘M Cool”
8. Look at pg 58 – 62 to help with the concept map – Fill out the overview of the cell cycle
9. The Cell CycleWhat are the 3 stages?InterphaseMitosisCytokinesisWhat are the 4 phases of Mitosis?Prophase MetaphaseAnaphaseTelophaseWhat happens?Cell growsDNA gets copiedPrepares for division
10. The Cell CycleWhat are the 3 stages?InterphaseMitosisCytokinesisWhat happens?Cell growsDNA gets copiedPrepares for division
11. Interphase: To Do List…page 58Fill in a few things you see on the to-do listGROWING:COPYING DNA:PREPARING FOR DIVISION:
12. Interphase – 1st stage of cell cyclemore details…GROWING:Cell grows to full sizeProduces organelles it needsMakes more enzymesCOPYING DNA:Makes an exact copy of DNA: REPLICATIONAt the end of replication, the cell has 2 identical sets of chromosomesPREPARING FOR DIVISION:Produces structures that will help it to dividecentrioles, spindle fibers, etc.
13. Background of a chromosomep. 59 (stage 2: Mitosis)Chromosomes are made of 2 rod-like parts called chromatids; chromatids are identical to each other w/ the same DNA.Centromere holds the two chromatids togetherWhen a cell divides, one chromatid will go to each new cell
14.
15. The Cell CycleWhat are the 3 stages?InterphaseMitosisCytokinesisWhat are the 4 phases of Mitosis?Prophase MetaphaseAnaphaseTelophaseWhat happens?Cell growsDNA gets copiedPrepares for division
16. STAGE 2: MITOSISThe cell’s nucleus divides into two new nuclei One set of DNA is distributed into each daughter cellDivided into 4 phases:
17. MITOSIS HAS 4 PHASESProphaseMetaphaseAnaphaseTelophase(Pandas Must Always Talk!)
18. Phases of MitosisPROPHASE:Chromosomes in the nucleus condense (smash together)Nuclear envelope breaks down
19. Phases of MitosisHow does prophase look different from interphase?InterphaseProphase
20. Phases of MitosisHow does prophase look different from interphase?Chromosomes condense (the Xs); the nucleus is changing (nuclear envelope goes away)
21. Phases of MitosisThe Cell CycleCells undergo an orderly sequence of events as they grow and divide. What are the missing parts of the stages?
22. Phases of MitosisMetaphase:Each chromosome attaches to a spindle fiber at its centromere. What is missing from the cell? What happened to the chromosomes?
23. Phases of MitosisThe nucleus is missing; chromosomes moved to the center of the cellMetaphase:Each chromosome attaches to a spindle fiber at its centromere. What is missing from the cell? What happened to the chromosomes?
24. Phases of MitosisMETAPHASE:Chromosomes move to center of the cellMeta = middle
25. Phases of MitosisAnaphase:The centromere of each chromosome splits, pulling the chromatids apart. Each is now called a chromosome. They are drawn by their spindle fibers to opposite ends of the cell. The cell stretches out. Draw the missing structures.
26. Phases of MitosisAnaphase:Draw the missing structures.
27. Phases of MitosisANAPHASE:Chromatids (now called chromosomes) move to opposite ends of the cellCell stretches out
28. Phases of MitosisTelophaseHow does the diagram of a cell in telophase look different from the one in anaphase?
29. Phases of MitosisTelophaseHow does the diagram of a cell in telophase look different from the one in anaphase?TelophaseNuclei are forming; spindle fibers have disappeared’ cell is pinched in around its middle.
30. Phases of MitosisTELOPHASE:Nuclei are forming (nuclear envelope reappears)Cell is pinching in at the middle
31. CytokinesisStage 3CytokinesisCell splits into two daughter cells. Each daughter cell has an identical set of chromosomes. Draw the daughter cell.
32. CytokinesisCytokinesis:Draw the daughter cell.
33. Stage 3: CytokinesisCytokinesis:Cytoplasm dividesEach daughter cell has the same number of chromosomes as the parent cell
34. STAGE 3: CytokinesisThe cell’s nucleus divides into two new nuclei One set of DNA is distributed into each daughter cellDivided into 4 phases:
35. Do the Math – p. 63Length of a Liver Cell CycleHuman liver cells generally reproduce less than once per year. At other times, they can complete one cell cycle in about 22 hours. The circle graph to the left displays this.
36. Do the Math – p. 63What do the three curved arrows outside of the circle represent?
37. Do the Math – p. 63What do the three curved arrows outside of the circle represent?Interphase, mitosis and cytokinesis
38. Do the Math – p. 63The wedge representing growth is in which stage of the cell cycle?
39. Do the Math – p. 63The wedge representing growth is in which stage of the cell cycle?Interphase
40. Do the Math – p. 63About what percentage of the cell cycle is shown for DNA replication?
41. Do the Math – p. 63About what percentage of the cell cycle is shown for DNA replication?About 45%
42. Do the Math – p. 63What stage of the cell cycle takes the shortest amount of time? How do you know?
43. Do the Math – p. 63What stage of the cell cycle takes the shortest amount of time? How do you know?Cytokinesis; it is the smallest section of the graph