Mitosis
• Mitosis- is the process in which a cell divides to form TWO IDENTICAL CELLS.
• Follows specific order of events during the process of mitosis: – Interphase, Prophase, Metaphase, Anaphase,
Telophase.
Step 1: Interphase• Interphase is how the
cell spends a majority of it’s life cycle (up to 90%).
• Normal functions.• When getting ready to
divide, the DNA winds up into chromosomes and duplicates but are NOT in X form yet.
Step 2: Prophase
• The newly created pairs are now visible as the X.
• Start moving to line up in the middle of the cell.
Step 3: Metaphase• Chromosomes, paired up, line up in the
middle of the cell “on top” of each other.
Step 4: Anaphase
• The paired chromosomes divide and pull to each side of the cell, which is beginning to elongate.
Meiosis
• Process in which sex organs (ovaries and testes) produce FOUR genetically DIFFERENT daughter cells.
• Contains TWO cell divisions.
• Each daughter cell gets HALF the chromosomes as the parent cell.
Prophase I
• DNA winds up, forms into chromosome shapes.
• Each finds it’s “homologous pair”- it’s partner.
Telophase I
• Cell membrane begins to pinch off into 2 cells, each with the same number of chromosomes as parent cell.