- Slides: 21
The Cell Cycle Cell Division
Cell Division • A cells must divide to make more cells.
The Cell Cycle The cell cycle is how cells grow and divide. 3 parts Interphase (Growth) Mitosis (Division) Cytokinesis (Cell Splits)
Interphase makes up most of the cell cycle & takes the longest!
Stage 1: Interphase • Interphase is the growth stage 1. 2. 3. Cell Grows Genetic material is copied Prepares for division
Review What is the longest stage of the cell cycle? a. Metaphase b. Interphase c. Chromophase d. Mitosis
The Genetic Material • All genetic material is found in the nucleus • The genetic material is called DNA • DNA is contained in thread-like structures called Chromosomes
The Genetic Material • After Chromosomes tighten up they are called Chromatids • They are held together by the centromere
Stage 2: Mitosis • Mitosis is when the cell nucleus divides into two identical nuclei. • New cells are produced for growth & repair • New cells are identical to the parent cells
Stages of Mitosis 1. Prophase 2. Metaphase 3. Anaphase 4. Telophase PMAT
Review The stage of the cell cycle in which the nucleus divides is known as: a. Interphase b. Mitosis c. Cytokinesis d. Prophase
Stage 1: Prophase • • Chromosomes form pairs The centrioles are moving to the poles (ends) Spindle fibers develop The nuclear membrane is breaking down.
Stage 2: Metaphase. • The chromatids line up in the middle of the cell • They attach to the spindle fibers
Stage 3: Anaphase • The chromosomes are pulled apart • They move to the opposite side of the cell.
Stage 4: Telophase • The Spindle fibers break apart • A new nuclear membrane forms • Two identical nuclei exist.
Review Which lists the phases of mitosis in order? a. prophase, metaphase, anaphase, telophase b. telophase, anaphase, metaphase, prophase c. metaphase, anaphase, prophase, telophase d. anaphase, prophase, metaphase, telophase
Stage 3: Cytokinesis • The cytoplasm separates • Left with two identical cells
Cytokinesis • This is the end of the cell cycle • Each new daughter cell has the same number of chromosomes as the parent cell!
Summary • Mitosis starts with one cell • It ends with two identical cells • Cells have the same number of chromosomes • 3 Stages of Cell Cycle: 1. Interphase 2. Mitosis (Prophase, Metaphase, Anaphase, Telophase) 3. Cytokinesis
Make a Cell Cycle Flipbook Stage Interphase Prophase Metaphase Anaphase Telophase Cytokinesis What happens to chromosomes? What happens in cell? Picture