Unit 3: Cell Division
Left Side
Unit Page
Flow Map – Cell Cycle
Pg
48
50
Right Side
Table of Contents
C.N. – The Cell Cycle
Pg
49
51

Interphase, Mitosis, and Cytokinesis
10-2

Learning Goals
 1. Summarize the cell cycle and what it results in.
 2. Describe the function of the cell cycle in both a unicellular and multicellular organism.
 3. Define chromosome and describe its parts.
 4. Describe what happens to the chromosomes in each of the 6 steps of the cell cycle.

How to write Cornell Questions
 Look at the headings in bold.
 Look at highlighted words & new vocab.
 Ask questions like these
 What is…
 How does … happen?
 Describe the process/structure/function of…
 You must have at least 4 questions for each page of notes!!!

 Cell Cycle cell division that results in
2 new daughter cells that are an exact copy of the original (parent) cell.

Cornell Questions:
 What is the cell cycle?
 What is the result of the cell cycle?

The Cell Cycle
 Three Main Stages:
 a) Interphase (95%)
 b) Mitosis (5%)
 c) Cytokinesis M Phase
M phase = cell division

 Unicellular organisms reproduce this way (asexual reproduction)
 Multicellular organisms make new cells this way
 Causes organisms to grow
 To replace old worn out cells
 Repair damaged cells

 Carry genetic information
•
DNA = genetic code
 Every organism has a different
# of chromosomes
 ex: humans have 46 (23 from mom &
23 from dad)


One chromosome = pair of sister chromatids
 Sister Chromatid = 1 copy of wound up DNA
 Sister chromatids are held together by a centromere centromere
Sister chromatid
Sister chromatid

Interphase
The Cell Cycle Mitosis
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis

occurs before mitosis begins
 Chromosomes, cytoplasm, and organelles are copied.
 The cell grows

1st step in Mitosis
 The genetic material (DNA) condenses into bundles called chromosomes .

 Nuclear membrane disappears
 Spindle fibers form
 Centrioles move to opposite sides of the cell

2 nd step in Mitosis
 The chromosomes line up along the middle of the cell


Spindle fibers attach to the centromeres of chromosomes

3 rd step in Mitosis
 Sister chromatids separate and move to opposite sides of the cell

4 th step in Mitosis
 Nuclear membrane forms around each set of chromosomes

 Chromosomes unwind into chromatin
 Spindle fibers disappear



Prophase
Metaphase
Telophase
Anaphase

occurs after mitosis
 The cytoplasm splits in two
 Result is two identical cells that have the same number of chromosomes as the original cell.

Learning Goals
 1. Summarize the cell cycle and what it results in.
 2. Describe the function of the cell cycle in both a unicellular and multicellular organism.
 3. Define chromosome and describe its parts.
 4. Describe what happens to the chromosomes in each of the 6 steps of the cell cycle.

Ticket out the Door
 New “Table of Contents” completed
 Notes glued in
 8 Cornell Question completed
 Learning goals copied.
 Homework: Summary answering
“Learning Goals”