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Transcript of Mitosis
The two chromatids separate, and each chromatid becomes a new chromosome.
The new chromosomes move to opposite ends of the cell.
The cell stretches out as the opposite ends are pushed apart. Mitosis: Anaphase The chromosomes begin to stretch out and lose their rodlike appearance.
A new nuclear envelope forms around each region of chromosomes.
The DNA is once again separated from the cytoplasm by a membrane. Mitosis: Telophase It takes an average of 24 hours for a cell to divide, depending on the tissue being duplicated. Somatic Cells: any body cell except a reproductive cell. The 6 Phases are:
6. Cytokinesis Interphase Period Before All Cell Division In this phase cells grow, make a copy of DNA, and prepare to divide into two new "daughter cells". Growing: The cell grows to its full size and produces structures it needs. Copy DNA The cell makes an EXACT copy of the DNA in its nucleus in a process called replication. Preparing for Division The cell produces structures that it will use to divide into two new cells. Chromatin in the nucleus condenses to form chromosomes.
The pairs of the centrioles move to opposite sides of the of the nucleus. Spindle fibers form a bridge between the ends of the cell.
The nuclear envelop breaks down. Mitosis: Metaphase The Chromosomes line up across the center of the cell.
Each chromosome attaches to a spindle fiber at its centromere. Cytokinesis The membrane pinches in around the middle of the cell.
The cell splits in two.
Each "daughter" cell ends up with an identical set of chromosomes and about half the organelles. Cytokinesis in Animal Cells The cell membrane squeezes together around the middle of the cell. It pinches into two new cells. Cytokinesis in Plant Cells The plant cell's rigid cell wall cannot squeeze, so a cell plate forms across the middle of the cell.
It slowly develops into two new cells and then forms a cell wall. The Structure of DNA DNA looks like a twisted ladder.
Each rung of DNA is made up of a pair of molecules called nitrogen bases.
4 Kinds of Nitrogen Bases:
Adenine / Thymine: AT
Guanine /Cytosine: GC