Unit 1-10 Notes Mr. Hefti – Pulaski Biology The Nervous and Endocrine Systems (Coordination)
Mitosis Unit 4-2 Notes Mr. Hefti – Pulaski Biology.
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Transcript of Mitosis Unit 4-2 Notes Mr. Hefti – Pulaski Biology.
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MitosisMitosisUnit 4-2 Notes
Mr. Hefti – Pulaski Biology
![Page 2: Mitosis Unit 4-2 Notes Mr. Hefti – Pulaski Biology.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697bf811a28abf838c854c1/html5/thumbnails/2.jpg)
1. Definition1. Definition
• Cell division producing 2 identical cells each having a complete set of homologous chromosomes (2N).– 2N means diploid– 1N means haploid
• Any new cells called daughter cells
• Mitosis for growth and repair!
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2. What is the diploid number in 2. What is the diploid number in humanshumans??
• Body cells have 23 pairs of chromosomes (23+23 = 46)
–Diploid
• Gametes (egg and sperm cells) have 23
–Haploid
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3. Which types of cells are made 3. Which types of cells are made this way?this way?• Muscle cells• Skin cells• Nerve cells• Bone cells• Many others…
• Think of all of the different types of cells in your toes!
• Every type of cell except gametes!
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4. How do the resulting cells 4. How do the resulting cells compare to each other?compare to each other?
• Genetically identical to each other and to the parent cell!
• Importance - preserves a cell’s structure and function
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5. What is the mathematical 5. What is the mathematical equation for mitosis?equation for mitosis?• 2N → 2N + 2N• Translation: “A diploid cell divides
and makes 2 new diploid cells.”
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6. What are the stages of 6. What are the stages of mitosis?mitosis?• Interphase: chromosomes replicate
• Prophase: chromosomes become visible and the nuclear envelope dissolves
• Metaphase: chromosomes line up in the middle
• Anaphase: chromosomes pull to opposite ends
• Telophase: cells separate
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7. What happens if the steps of 7. What happens if the steps of mitosis don’t go in order?mitosis don’t go in order?
• Most likely result… the cells do not develop properly and die
• Sometimes the new cells will survive with a mutation
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• _________ phase: chromosomes replicate• _________ phase: chromosomes become visible and the nuclear envelope dissolves• _________ phase: chromosomes line up in the middle• _________ phase: chromosomes pull to opposite ends• _________ phase: cells separate
• _________ phase: chromosomes replicate• _________ phase: chromosomes become visible and the nuclear envelope dissolves• _________ phase: chromosomes line up in the middle• _________ phase: chromosomes pull to opposite ends• _________ phase: cells separate
• _________ phase: chromosomes replicate• _________ phase: chromosomes become visible and the nuclear envelope dissolves• _________ phase: chromosomes line up in the middle• _________ phase: chromosomes pull to opposite ends• _________ phase: cells separate
• _________ phase: chromosomes replicate• _________ phase: chromosomes become visible and the nuclear envelope dissolves• _________ phase: chromosomes line up in the middle• _________ phase: chromosomes pull to opposite ends• _________ phase: cells separate