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Transcript
Name: _______________________________________________ Section: _______________________________________________ Date: _______________________________________________ Mitosis Notes - Cells that perform mitosis: Somatic cells (Body cells) - Steps that occur before mitosis: o _________________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ - What happens to the chromosome number before mitosis: - What happens to the chromosomes physically before mitosis: - Steps of mitosis: o _________________________________________________________________________________________________________ o _________________________________________________________________________________________________________ o _________________________________________________________________________________________________________ o _________________________________________________________________________________________________________ - Details of each step: o _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ o _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ o _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ o _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ _________________________________________________________________________________________________________ - Cytokinesis: __________________________________________________________________________________________________ _________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ - End result of mitosis: ________________________________________________________________________________________ _________________________________________________________________________________________________________________ - Why it is so important that body cells complete mitosis: _______________________________________________ _________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ Mitosis Notes - Cells that perform mitosis: Somatic cells (Body cells) - Steps that occur before mitosis: o Interphase - G1: Cell grows and makes new organelles S: DNA replicates G2: Cell grows and checks itself for mistakes What happens to the chromosome number before mitosis: Interphase 10 - What happens to the chromosomes physically before mitosis: I I I I I I I I I I - 20 Steps of mitosis: o Prophase o Metaphase o Anaphase o Telophase Interphase X X X X X X X X X X - Details of each step: o Chromatin condenses and DNA forms chromatids (chromosomes) o The nuclear envelope (membrane) disappears o Spindle fibers form and connect to the chromosomes (move them around the cell) o Meta – middle o Spindle fibers pull the chromosomes and they are lined up in the middle of the cell. o Spindle fibers pull apart pulling the sister chromatids apart 1 copy goes to 1 side of the cell The 2nd copy goes to the other side of the cell o Spindle fibers detach for the chromosomes and disappear o Nuclear membranes reform around the DNA o DNA (chromatids) unravel to the chromatin form - Cytokinesis: Division of the cytoplasm; cytoplasm divides and cell membrane pinches off forming 2 new cells. - End result of mitosis: 2 daughter cells that are identical to the parent cell (same number of chromosomes and same combination of DNA as the parent cell). - Why it is so important that body cells complete mitosis: The new cell needs to complete the same function as the parent sell, so they need the same number of chromosomes and the same combination of DNA to do that.