cell division
DESCRIPTION
Cell Division. Cells & Heredity Chapter 2.3 Pages 61-68. The Cell Cycle. The sequence of growth and division of cells is called the Cell Cycle . Consists of 3 main stages…. Stage 1 - Interphase. Cell grows to maturity, completely forming its functional structures Doubles in size - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/1.jpg)
Cell DivisionCells & Heredity Chapter 2.3
Pages 61-68
![Page 2: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/2.jpg)
The Cell Cycle• The sequence of growth and division of cells is
called the Cell Cycle.
Consists of 3main stages…
MitosisCytokinesisInterphase
![Page 3: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/3.jpg)
Stage 1 - Interphase
• Cell grows to maturity, completely forming its functional structures
• Doubles in size• Copies its DNA in the
nucleus via Replication• Cell prepares to divide.
![Page 4: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/4.jpg)
Stage 2 - Mitosis
• A copy of DNA is distributed to each of 2 daughter cells
• Four Phases– Prophase– Metaphase– Anaphase– Telophase
![Page 5: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/5.jpg)
Key Terms• Chromatin: Material in cells that contain DNA• Chromosome: doubled rod of condensed
chromatin• Chromatid: identical strands held together by
a centromere.
![Page 6: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/6.jpg)
1. Prophase– Chromatin condenses to
chromosomes– Spindle fibers form bridge
2. Metaphase– Chromosomes align in
center– Attach to spindle fibers
3. Anaphase– Chromosomes split as
spindles retract– Cell begins stretching
4. Telophase– Chromosomes stretch out– Nuclear membrane forms
![Page 7: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/7.jpg)
Stage 3 - Cytokinesis
• Cytoplasm separates organelles as it divides into two cells
• The membrane pinches off– Plant cells can not
pinch, instead form a cell plate.
![Page 8: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/8.jpg)
Round & Round
• Duration of Cell Cycle varies on type of cell being created– Liver cells take 22
hours– Brain cells never
divide.
![Page 9: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/9.jpg)
What to Work On
• Read Section 2.3 in the textbook– Pages 61 to 68
• Answer the Section Review questions– Page 68– Numbers 1 through 4.
![Page 10: Cell Division](https://reader035.vdocuments.us/reader035/viewer/2022070421/56816023550346895dcf27f8/html5/thumbnails/10.jpg)
What to Work On
• Complete the following Section Reviews– Page 44, #1-4– Page 54, #1-4– Page 59, #1-5