Chapter: Cell Reproduction
[Pages:100]Table of Contents
Chapter: Cell Reproduction
Section 1: Cell Division and Mitosis
Section 2: Sexual Reproduction and Meiosis
Section 3: DNA
Cell Division and Mitosis
1 Why is cell division important?
? Many organisms start as just one cell.
? That cell divides and becomes two, two become four, four become eight, an so on.
? Many-celled organisms, including you, grow because cell division increases the total number of cells in an organism.
Cell Division and Mitosis
1 Why is cell division important?
? Even after growth stops, cell division is still important.
? Every day, billions of red blood cells in your body wear out and are replaced.
? During a few seconds, your bone marrow produced about six million red blood cells.
? Cell division is important to one-celled organisms, too--it's how they reproduce themselves.
Cell Division and Mitosis
1 The Cell Cycle
? A living organism has a life cycle.
? A life cycle begins with the organism's
formation, is followed by growth
and development, and finally ends in death.
? Individual cells also have life cycles.
Click image to view movie.
Cell Division and Mitosis
1 Length of Cycle
? The cell cycle is a series of events that takes place from one cell division to the next.
? The time is takes to complete a cell cycle is not the same in all cells.
Cell Division and Mitosis
1 Interphase
? Most of the life of any eukaryotic cell--a cell with a nucleus--is spent in a period of growth and development called interphase.
? Cells in your body that no longer divide, such as nerve and muscle cells, are always in interphase.
? An actively dividing cell, such as a skin cell, copies its hereditary material and prepares for cell division during interphase.
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