Wednesday Jan 29, 2014 Bell Ringer

Agenda• Quiz• Cell Cycle

Puzzle• Notes• HW: Cell

Cycle Wkst

Today’s goal: explain the process of cell division.

If all cells come from preexisting cells then how do your cells make more cells?

Reminder• We will begin having Bell Ringer/Homework

Quizzes. Quizzes are 15% of your grade

• You get 10 Class Participation Points a day. Class Participation is 10% of your grade.

• I am available for tutoring any day after school.

• I only discuss grades before or after school but you can always email me.

Recovery Classes

• Biology Tues and Thursday 3:30-6:30

Cell Cycle Puzzle

• In a group of 4 work together to cut the pictures out and place them in order to create the cell cycle.

Cell Theory1. All living things are made of one or

more cells.

2. Cells are the basic units of structure and function in organisms.

3. All cells come from preexisting cells.

Cell Cycle

What is it? A relaxed stringy form of DNAWhere in the cell can you find it? The NucleusWhat does it look like? Spaghetti

What is it? Condensed organized form of DNAWhat is it created from? ChromatinWhat does it look like? An X

Chromatin

Chromosome

#1 The Nucleus is the__________of the cell.

#2 The Nucleus contains______________________,which are the instructions for the cell.

#3 These instruction are found in the____________. You have 46 total, 23 from mom and 23 from dad.

#4 Why does the cell need to copy these instructions before dividing?

Nucleus= Control Center

DNA= Instructions

Chromosomes=Library

Thursday Jan 30, 2014 Bell Ringer

• Why do our cells grow and divide?

Agenda• BR• Go Over

Hmwk• Notes• HW: Cell

Cycle Wkst #2

Today’s goal: describe what happens in each stage of the cell cycle.

Why do our cells grow and divide?

#1 1) ReproductionASEXUAL – create identical offspring to

parent

SEXUAL – offspring is combination of 2 parents

• Asexual Reproduction– Binary Fission– Budding– Regeneration– Vegetative Propagation

• Benefits of Asexual Reproduction (mitosis)– Quick way to produce

many offspring– Don’t need to find a mate– Best for stable

environments

• Benefits of Sexual Reproduction (meiosis)– Though it takes

more time and energy it produces more genetic variety

2)Growth

DEVELOPMENT-How you increase in size from a baby to an adult

GrowthCELL

DIFFERENTIATION-how you go from one cell to trillions of different cells with specialized functions.

• How were you born video (6 mins)

• http://www.youtube.com/watch?v=POJAQX760VY

3) RepairRegenerate lost tissue

Replace aging cells

The Cell Cycle

A. Interphase – cell grows and prepares for cell division by copying chromosomes and making more organelles

B. Mitosis – Chromosomes separate into two nuclei

C. Cytokinesis-Cytoplasm separates forming 2 identical cells

Cell Cycle

G1-Gap 1 phaseHow are these pictures of the same cell different?

G1-Gap 1 phaseLarger, More Organelles

What must a cell do before it divides????

What must a cell do before it divides????

• DNA Replicates-Meaning each chromosome must make an exact copy of itself.

• These copies are made during the S-phase of interphase.

• We call these copies sister chromatids

• Its these copies that separate during mitosis.

Organism Number of Chromosomes

Goldfish 94

Shrimp 254

Chimpanzee 48

Fruit Fly 8

Peas 14

S-Synthesis phase#2 What happens in S phase?

S-Synthesis phase#2 Chromosomes Replicate

Friday Jan 31, 2014Bell Ringer

Grab the sheet from the black box and answer the questions. It will be collected in 10 mins.

Agenda• BR• Notes• Worksheet• HW: Read

and outline Sec 9.3 due Monday

Today’s goal: Identified the stages of the cell cycle in onion tissue.

• Which phase is most Variable?

• Infer function of these two cells?

What must a cell do before it divides????

• DNA Replicates-Meaning each chromosome must make an exact copy of itself.

• These copies are made during the S-phase of interphase.

• We call these copies sister chromatids

• Its these copies that separate during mitosis.

Sister Chromatids

What are they?

A chromosome has how many sister chromatids?

Centromere

What is it?

Identical joined copies of DNA

Two

It holds the sister chromatids together

S-phase

Fig. 12-UN3

1. ProphaseWhat first appears?

What disappears?

What forms to help arrange chromosomes?

1. ProphaseWhat first appears? Chromosomes

What disappears? Nuclear Membrane

What forms to help arrange chromosomes? Spindle Fibers

2. MetaphaseWhere do the chromosomes go?

2. MetaphaseWhere do the chromosomes go? The Middle

3. AnaphaseWhat happens to the sister chromatids

(copies)?

3. AnaphaseWhat happens to the sister chromatids

(copies)? Split and move to opposite sides of the cell

4. TelophaseWhat reforms during telophase?

4. TelophaseWhat reforms during telophase? Nuclear

Membranes

Prophase

Fig. 12-6a

PrometaphaseG2 of Interphase

Fig. 12-6c

Metaphase Anaphase Telophase and Cytokinesis

Fig. 12-UN5

Fig. 12-UN1

Telophase andCytokinesis

Anaphase

Metaphase

Prometaphase

Prophase

MITOTIC (M) PHASE

Cytokinesis

Mitosis

SG1

G2

5. CytokinesisWhat is cytokinesis?

What phase occurs after cytokinesis?

5. CytokinesisWhat is cytokinesis? When the cytoplasm

divides producing 2 identical cells.

What phase occurs after cytokinesis? Interphase G1

• How the Cell Cycle Works Video

• http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter10/how_the_cell_cycle_works.html

• http://www.youtube.com/watch?v=VGV3fv-uZYI

Exit Slip-What happens in each

• Interphase?– G1– S– G2

• Mitosis?

• Cytokinesis?