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Phases Of Mitosis
- 1. Objectives: ✤To identify the phases of mitosis ✤To learn what happens in each phase Pictures in this presentation are courtesy of Wikimedia Commons
- 2. The Phases of Mitosis Metaphase Anaphase Prophase Telophase
- 3. Prophase
- 4. Prophase ✴1st stage of mitosis
- 5. Prophase ✴1st stage of mitosis ✴Chromatin condenses down to form chromosomes
- 6. Prophase ✴1st stage of mitosis ✴Chromatin condenses down to form chromosomes ✴The nuclear envelope breaks down and disappears
- 7. Prophase ✴1st stage of mitosis ✴Chromatin condenses down to form chromosomes ✴The nuclear envelope breaks down and disappears ✴Centrosomes appear near the middle of the cell and move toward the poles of the cell.
- 8. Prophase ✴1st stage of mitosis ✴Chromatin condenses down to form chromosomes ✴The nuclear envelope breaks down and disappears ✴Centrosomes appear near the middle of the cell and move toward the poles of the cell. ✴Spindle fibers form.
- 9. Metaphase
- 10. Metaphase
- 11. Metaphase ✴2nd stage of mitosis
- 12. Metaphase ✴2nd stage of mitosis ✴Where the chromosomes line up in the middle of the cell
- 13. Anaphase
- 14. Anaphase ✴3rd stage of mitosis
- 15. Anaphase ✴3rd stage of mitosis ✴Begins when the chromosomes begin to move apart
- 16. Anaphase ✴3rd stage of mitosis ✴Begins when the chromosomes begin to move apart ✴Ends when the chromosomes reach the poles of the cell and stop moving.
- 17. Telophase
- 18. Telophase
- 19. Telophase ✴4th stage of mitosis
- 20. Telophase ✴4th stage of mitosis ✴Chromosomes de- condense and unwind back into chromatin.
- 21. Telophase ✴4th stage of mitosis ✴Chromosomes de- condense and unwind back into chromatin. ✴The nuclear envelope re- forms.
- 22. Telophase ✴4th stage of mitosis ✴Chromosomes de- condense and unwind back into chromatin. ✴The nuclear envelope re- forms. ✴Centrosomes break down.
- 23. Telophase ✴4th stage of mitosis ✴Chromosomes de- condense and unwind back into chromatin. ✴The nuclear envelope re- forms. ✴Centrosomes break down. ✴Spindle fibers break down.
- 24. 1. 2. 3. 4.
- 25. Quiz Question 1: Which of the cells represents prophase? 1. 2. 3. 4.
- 26. Quiz 1. 2. 3. 4.
- 27. Quiz Question 2: Which of the cells represents metaphase? 1. 2. 3. 4.
- 28. Quiz 1. 2. 3. 4.
- 29. Quiz Question 3: Which of the cells represents anaphase? 1. 2. 3. 4.
- 30. Quiz 1. 2. 3. 4.
- 31. Quiz Question 4: Which of the cells represents telophase? 1. 2. 3. 4.
- 32. Quiz 1. 2. 3. 4.
- 33. Quiz 1. 2. 3. 4.
- 34. Quiz Question 5: Which of the cells represents the phase in which chromosomes form? 1. 2. 3. 4.
- 35. Quiz 1. 2. 3. 4.
- 36. Quiz 1. 2. 3. 4.
- 37. Quiz Question 6: Which of the cells represents the phase in which chromosomes begin to move 1. apart? 2. 3. 4.
Editor's Notes
- Mitosis has four phases, we will go through each phase. When going through each phase we will cover two areas. First, we will learn how to identify the phase by looking at it in both a diagram and an actual cell. Secondly, we will learn what is happening in the cell during that time.
- We will go through each cell and see what happens. At the end we will take a quiz.
- Chromatin is DNA that is uncoiled and not wound around histone proteins. You cannot see chromatin with a light microscope. When we look at onion cells, we can see chromosomes, but not chromatin. Why do you think the nucleus needs to break down? The centrosomes are different between plant and animal cells. Animal cells have centrioles which are tube like structures made of the protein tubulin. Spindle fibers will eventually act like cables to move the chromosomes around. When spindle fiber forms comes on go back to phases slide.
- Chromatin is DNA that is uncoiled and not wound around histone proteins. You cannot see chromatin with a light microscope. When we look at onion cells, we can see chromosomes, but not chromatin. Why do you think the nucleus needs to break down? The centrosomes are different between plant and animal cells. Animal cells have centrioles which are tube like structures made of the protein tubulin. Spindle fibers will eventually act like cables to move the chromosomes around. When spindle fiber forms comes on go back to phases slide.
- Chromatin is DNA that is uncoiled and not wound around histone proteins. You cannot see chromatin with a light microscope. When we look at onion cells, we can see chromosomes, but not chromatin. Why do you think the nucleus needs to break down? The centrosomes are different between plant and animal cells. Animal cells have centrioles which are tube like structures made of the protein tubulin. Spindle fibers will eventually act like cables to move the chromosomes around. When spindle fiber forms comes on go back to phases slide.
- Chromatin is DNA that is uncoiled and not wound around histone proteins. You cannot see chromatin with a light microscope. When we look at onion cells, we can see chromosomes, but not chromatin. Why do you think the nucleus needs to break down? The centrosomes are different between plant and animal cells. Animal cells have centrioles which are tube like structures made of the protein tubulin. Spindle fibers will eventually act like cables to move the chromosomes around. When spindle fiber forms comes on go back to phases slide.
- Chromatin is DNA that is uncoiled and not wound around histone proteins. You cannot see chromatin with a light microscope. When we look at onion cells, we can see chromosomes, but not chromatin. Why do you think the nucleus needs to break down? The centrosomes are different between plant and animal cells. Animal cells have centrioles which are tube like structures made of the protein tubulin. Spindle fibers will eventually act like cables to move the chromosomes around. When spindle fiber forms comes on go back to phases slide.
- Metaphase is one of the easier phases to identify. The chromosomes are lined up in the middle with each half positioned to go to opposite sides of the cell. There are only two bullets here, then go back to phases slide.
- Metaphase is one of the easier phases to identify. The chromosomes are lined up in the middle with each half positioned to go to opposite sides of the cell. There are only two bullets here, then go back to phases slide.
- Metaphase is one of the easier phases to identify. The chromosomes are lined up in the middle with each half positioned to go to opposite sides of the cell. There are only two bullets here, then go back to phases slide.
- Anaphase is the actual movement of the chromosomes to opposite sides of the cell. You can tell when the chromosomes are moving, because the spindle fibers are hooked to the middle of each chromosome so the tails of the chromosome trail behind. It looks like a V on its side with the bottom of the V going toward the outer part of the cell. Three bullets here, then go back to phases slide
- Anaphase is the actual movement of the chromosomes to opposite sides of the cell. You can tell when the chromosomes are moving, because the spindle fibers are hooked to the middle of each chromosome so the tails of the chromosome trail behind. It looks like a V on its side with the bottom of the V going toward the outer part of the cell. Three bullets here, then go back to phases slide
- Anaphase is the actual movement of the chromosomes to opposite sides of the cell. You can tell when the chromosomes are moving, because the spindle fibers are hooked to the middle of each chromosome so the tails of the chromosome trail behind. It looks like a V on its side with the bottom of the V going toward the outer part of the cell. Three bullets here, then go back to phases slide
- Telophase is the opposite of prophase. What is done during prophase is re-done in telophase. For example, in prophase the nucleus breaks down, in telophase the nucleus is re-formed. Can you give any other examples? 5 bullets here, then go back to phases slide.
- Telophase is the opposite of prophase. What is done during prophase is re-done in telophase. For example, in prophase the nucleus breaks down, in telophase the nucleus is re-formed. Can you give any other examples? 5 bullets here, then go back to phases slide.
- Telophase is the opposite of prophase. What is done during prophase is re-done in telophase. For example, in prophase the nucleus breaks down, in telophase the nucleus is re-formed. Can you give any other examples? 5 bullets here, then go back to phases slide.
- Telophase is the opposite of prophase. What is done during prophase is re-done in telophase. For example, in prophase the nucleus breaks down, in telophase the nucleus is re-formed. Can you give any other examples? 5 bullets here, then go back to phases slide.
- Telophase is the opposite of prophase. What is done during prophase is re-done in telophase. For example, in prophase the nucleus breaks down, in telophase the nucleus is re-formed. Can you give any other examples? 5 bullets here, then go back to phases slide.
- Telophase is the opposite of prophase. What is done during prophase is re-done in telophase. For example, in prophase the nucleus breaks down, in telophase the nucleus is re-formed. Can you give any other examples? 5 bullets here, then go back to phases slide.
- This slide shows an actual cell. Look at the slide and see if you can identify each of the four phases of mitosis in an actual cell. The tough one is metaphase. To identify metaphase you will need to look for the middle of the chromosomes and see if they are lined up in the middle of the cell. Don’t look at the legs, because they are flopped to the sides. I will give you a few minutes to decide which number corresponds to which phase and then I will call on some of you to see if we are correct.
- Take out a blank sheet of paper. Put your answers to the following questions on your blank sheet of paper. When you are finished with a question, please put down you pen, so I can see when everyone is done with that question, before I move on to the next question.