Mitosis

Tackle Tuesday-Cell Cycle Questions in Google Classroom 1. What is the longest stage of the cell cycle called? 2. During what phase is DNA replicated? 3. During what phase does the cell grow? 4. What phase of the cell cycle does the cell prepare for mitosis? 5. Put the phases in the correct order: Mitosis, G2, G1, Cytokinesis, S phase Why do cells divide?

Mitosis Two daughter cells are produced with an identical copy of the parent’s DNA

Mitosis- Notes Divide journal into 6 boxes. Title the boxes in this order: Interphase Prophase Metaphase Anaphase Cytokinesis

How does the cell know how to divide? Cell Division Reproduction Growth Repair Why do cells divide? How does the cell know how to divide? The DNA has the instructions for all of the cell’s activities.

Cell Cycle 3 Parts The sequence of development and division of a cell Interphase - Preparation Mitosis – Cell division Cytokinesis – Splitting Adult human cell: ~24 hrs 18-20 hours in interphase 2 hours in mitosis Embryonic cells: 30 min. How long does it take?

Interphase What happens Cell doubles in size DNA replicates Organelles double in number

Mitosis: PROPHASE What happens DNA forms chromosomes Spindle forms Centrioles move toward opposite poles Nuclear membrane begins to disappear

Mitosis: METAPHASE What happens Nucleus has disappeared completely Chromosomes line up in the middle of the cell “equator”

Mitosis: ANAPHASE What happens Centromeres divide Chromatids separate and move to opposite poles

Mitosis: TELOPHASE What happens Nuclear membrane forms around each group of chromosomes Chromosomes unwind Cytokinesis begins

Cytokinesis Cytoplasm divides One cell becomes 2 cells What happens