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Cell Reproduction Chapter 4.

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Presentation on theme: "Cell Reproduction Chapter 4."— Presentation transcript:

1 Cell Reproduction Chapter 4

2 Cell Growth and Division Chapter 4-1
Cells undergo division to: Increase in number Repair worn out cells Replace cells that have died

3 Cell cycle Interphase – most of the life of any cell
period of growth and development DNA replication growth and preparation for mitosis Nerve and muscle cells don’t divide remain in interphase Skin cells constantly change

4 Mitosis The process in which the nucleus divides to form two identical nuclei. It is a series of phases or steps.

5 Animal Mitosis Interphase – Nucleus can be seen DNA is replicating
(making exact copies)

6 Prophase – Chromosomes visible Nucleolus and nuclear membrane fade
Centrioles move to opposite end of cell Spindle fibers begin to stretch across the cell

7 Metaphase- Double strands of chromosomes line up across the center of cell Attach to a spindle

8 Centromere – place where double stranded chromosomes are held together

9 Anaphase Anaphase Centromeres divide Two strands separate
Separate strands move away toward opposite ends of cell

10 Telophase Centrioles and spindles disappear
Chromosomes stretch out and become harder to see

11 Nuclear membrane forms around each mass of chromosomes
New nucleolus appears Cell begins to split by pinching at cell membrane

12 Daughter cells – new cells that divided from a parent cell

13 Mitosis                                       

14 Mitosis in Plant Cells All phases are the same as animal cells
Telophase Cell wall is produced to separate the cells.                                       

15 http://www. biology. arizona

16 Identify each phase of mitosis below.

17 Identify animal mitosis

18 Results of Mitosis Two Important results of mitosis:
Nucleus was divided Two new nuclei are identical

19 Cytokinesis The period of the cell cycle when the cell separates into two daughter cells Animal cell cytokinesis – cell membrane pinches in the middle and a new membrane is formed Plant cell cytokinesis – cell wall is formed between the two daughter cells, then a cell membrane forms and completely separates.  .

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