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The Cell Cycle The Three Stages of the Cell Cycle Stage 1: Interphase Stage 2: Mitosis Stage 3: Cytokinesis Stage 1: Interphase Growth: The cell doubles in size and produces all structures needed to carry out the life processes. DNA Replication: The cell makes a copy of its DNA. Preparation for Division: The cell makes structures it will use to divide during the rest of the cell cycle. Stage 2: Mitosis Mitosis is the stage of the cell cycle during which the nucleus of the cell divides into two nuclei. Each copy of the DNA is distributed to the daughter cells. Stage 2: Mitosis Phase 1: Prophase The chromatin condense and coil to form chromosomes. Spindle fibers form a bridge at the ends of the cell. The nuclear membrane breaks down and disappears. Stage 2: Mitosis Phase 2: Metaphase The chromosomes line up across the center of the cell. Each chromosome is attached by its centromere to a spindle fiber. Stage 2: Mitosis Phase 3: Anaphase The centromeres split and one chromatid moves along the spindle fiber to one end of the cell. The other chromatid moves along the spindle fiber to the other end of the cell. The cell becomes stretched out. Stage 2: Mitosis Phase 4: Telophase The chromosomes stretch and lose their rod like appearance. The nuclear membrane forms around each of the sets of chromosomes Stage 3: Cytokinesis The DNA and organelles are distributed to each of the new daughter cells. The cytoplasm divides to form two separate daughter cells. Stage3 : Cytokinesis In animal cells, the cytoplasm pinches in around the middle of the cell. Eventually the cell divides in two. In plant cells, a cell plate forms across the middle of the cell. The cell plates develop into a new cell membrane. The cell wall forms around the cell membrane. The End