Mitosis: Cell Division Mrs. Harper Biology 11/14/17

November 14, 2017 Download notes Begin working on Do Now Have homework (Interphase Packet) out on desk

DO NOW 11/14/17 What are the three phases of interphase? In which phase does DNA replicate? What happens in G0? In which phase are centrioles made? What happens in G1? Explain what happens in G2. What is the period of cell division called?

Cell Cycle Part 2: Mitosis

Where it all began… We all start as a cell smaller than a period at the end of a sentence… S3

Getting from there to here… Going from egg to baby to adolescent to adult….. the original fertilized egg has to divide… and divide… S5

Mitosis (Cell Division) Cell Division (Mitosis) — process by which a cell divides into 2 new cells Two daughter cells that are genetically identical to the parent cell 2 Daughter Cells Parent Cell

Why do cells need to divide? Living things grow by producing more cells Repair of damaged tissue If cell gets too big, it cannot get enough nutrients into and wastes out of the cell

Mitosis occurs in all the somatic (body) cells Mitosis – division of the nucleus into 2 nuclei, each with the same number of chromosomes Mitosis occurs in all the somatic (body) cells -Why does mitosis occur? So each new daughter cell has nucleus with a complete set of chromosomes

4 phases of nuclear division (mitosis), directed by the cell’s DNA (PMAT) Prophase Metaphase—(Middle) Anaphase—(Apart) Anaphase—(Apart) Telophase—(Two)

Prophase Chromosomes coil up Nuclear envelope disappears Spindle fibers form

Metaphase—(Middle) Chromosomes line up in middle of cell Spindle fibers connect to chromosomes

Anaphase—(Apart) Chromosome copies pull apart Spindle fibers pull chromosomes to opposite poles

Telophase—(Two) Chromosomes uncoil Nuclear envelopes form 2 new nuclei are formed Spindle fibers disappear

Cytokinesis — the division of the cytoplasm In animal cells, the cytoplasm pinches in In plant cells, a cell plate forms After mitosis and cytokinesis, the cell returns to Interphase

Mitosis in plant cell S24

Summary: Cell Cycle Interphase Mitosis (PMAT) Cytokinesis

Mitosis Recap (PMAT) VIDEO: https://www.youtube.com/watch?v=CdWn_qRToyw

Assignment Work on Mitosis Packet silently and independently on Code Red Unfinished classwork is homework