U7L1 - Mitosis

600 views

Published on

Science Fusion PowerNotes used by Paoli Community School Corp.

Published in: Science, Technology, Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
600
On SlideShare
0
From Embeds
0
Number of Embeds
8
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

U7L1 - Mitosis

  1. 1. Unit 7 Lesson 1 Mitosis Copyright © Houghton Mifflin Harcourt Publishing Company
  2. 2. Unit 7 Lesson 1 Mitosis Indiana Standards Copyright © Houghton Mifflin Harcourt Publishing Company • 8.3.1 Explain that reproduction is essential for the continuation of every species and is the mechanism by which all organisms transmit genetic information. • 8.3.3 Explain that genetic information is transmitted from parents to offspring mostly by chromosomes. • 8.3.4 Understand the relationship between deoxyribonucleic acid (DNA), genes, and chromosomes.
  3. 3. Splitsville! Copyright © Houghton Mifflin Harcourt Publishing Company Why do cells divide? • Cell division takes place for different reasons. • Cell division is important for asexual reproduction, which involves only one parent organism. • Most growth in a multicellular organism happens because cell division produces new cells. • Cell division produces cells for repair. Unit 7 Lesson 1 Mitosis
  4. 4. What happens to genetic material during cell division? • The genetic material in cells is called DNA. • In eukaryotic cells, DNA is found in the nucleus. • A DNA molecule contains the information that determines the traits that a living thing inherits and needs to live. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  5. 5. What happens to genetic material during cell division? • During most of a cell’s life cycle, DNA is found in a mass of loose strands called chromatin. • Before cell division, DNA is duplicated. • As cell division begins, the chromatin are compacted into visible structures called chromosomes. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  6. 6. What happens to genetic material during cell division? • A duplicated chromosome is made of two identical structures called chromatids. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  7. 7. Around and Around Copyright © Houghton Mifflin Harcourt Publishing Company What are the stages of the cell cycle? • The life cycle of a eukaryotic cell, called the cell cycle, can be divided into three stages: interphase, mitosis, and cytokinesis. Unit 7 Lesson 1 Mitosis
  8. 8. What are the stages of the cell cycle? • Interphase is the stage in the cell cycle during which the cell is not dividing. • The cell grows to about twice the size it was when it was first produced. It produces various organelles and engages in normal life activities. • Changes that occur during interphase prepare a cell for division. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  9. 9. What are the stages of the cell cycle? • In eukaryotic cells, mitosis is the part of the cell cycle during which the nucleus divides. • Prokaryotes do not undergo mitosis because they do not have a nucleus. • Mitosis results in two nuclei that are identical to the original nucleus. • When mitosis is complete, the cell has two identical sets of chromosomes in two separate nuclei. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  10. 10. What are the stages of the cell cycle? • Cytokinesis is the division of the parent cell’s cytoplasm. • Cytokinesis starts during the last step of mitosis and eventually forms two complete cells. • In plant cells, a cell plate forms during cytokinesis. The cell plate separates the cell into two new cells. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  11. 11. Phasing Out Copyright © Houghton Mifflin Harcourt Publishing Company What are the phases of mitosis? • There are four phases of mitosis: prophase, metaphase, anaphase, and telophase. • By the end of the four phases, the cell will have two identical nuclei. Unit 7 Lesson 1 Mitosis
  12. 12. What are the phases of mitosis? • In prophase, the chromatin in the nucleus condense into chromosomes. The membrane around the nucleus breaks down. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  13. 13. What are the phases of mitosis? • In metaphase, the chromosomes line up in the middle of the cell. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  14. 14. What are the phases of mitosis? • In anaphase, each chromosome breaks up into two chromatids. They are pulled to opposite sides of the cell. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  15. 15. What are the phases of mitosis? • In telophase, a new nuclear membrane forms around each group, and the chromosomes unwind into chromatin. • After telophase, cytokinesis begins. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis
  16. 16. What are the phases of mitosis? • After mitosis, cytokinesis results in two new cells, and the two new cells start the cell cycle again. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 1 Mitosis

×