Asexual Reproduction presents:

1 1

Asexual Reproduction presents:

Mrs. StewartHonors Biology: Cell Growth and Division

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MITOSIS

A CELL GROWTH

AND DIVISION

PRODUCTION

How do little elephants grow up to be BIG elephants?

BELL WORK

Are the cells of the adult elephant larger than those of the baby?

BELL WORK

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Why do animals shed their skin?

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How does a cut heal?

Three reasons why cells reproduce by asexual reproduction:

1. Growth 2. Repair 3. Replacement

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ASEXUAL REPRODUCTION

REQUIRES ONLY ONE PARENT

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At what point does it become necessary for a

cell to divide?When the cells resources are under too great a strain from it’s size• Cell Membrane not large enough to maintain needs

coming in/going out• DNA, used for protein synthesis, cant keep up with

demands• Organelles unable to keep up with demands (ie:

waste removal)

BANDWIDTH EXAMPLEHow fast can you surf the internet, download an app or play your video games online?

Does the amount of other people using

the connection matter?

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Somatic CellsEvery cell in the body

EXCEPT reproductive cells (gametes)Gamete

Sexual reproduction cellsExample: sperm for males,

Ova/eggs for females

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CELL C

YCLE

Stages:1. Interphase

a)G1b)Sc) G2

2. Mitosis – M phasea)Prophaseb)Metaphasec) Anaphased)Telophasee)Cytokinesis

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Which phase

does the cell

spend the most

time in?

Interphase

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Create your graphic organizer

INTERPHASE ANAPHASE

PROPHASE TELOPHASE

METAPHASE CYTOKINESIS

CELL CYCLE

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Interphase• Time between cell divisions• 90% of a cell’s life

3 phases:1. G1: Growth and everyday

activities

2. S: DNA replication

3. G2: preparation for Mitosis (production of necessary proteins/organelles)

The process of dividing the nucleus

to create two daughter cells, identical to the

mother cell

Mitosis

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Mitosis• Creates two daughter cells that are

identical to each other AND identical to the parent cell

• Creates diploid cells (two sets of chromosomes in each daughter cell)

• Allows organisms to grow• Allows organisms to replace

damaged/worn out cells• P-M-A-T-C

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PRO

PHA

SE•The DNA organizes into chromosomes

•The nuclear membrane disappears

Chromatin – (visible DNA) - DNA tightly wrapped around proteins

Chromosomes – (condensed chromatin) – thread-like structures to allow DNA to be passed from parent to daughter cells

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META

PHA

SEChromosomes attach to spindle fibers (by their centromeres), and line up at the center of the cell

Spindle Fibers – microtubules that help separate chromosomes during division

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AN

APH

ASE

Chromosomes separate at the

centromere, and the chromatids are pulled toward opposite ends

of the cell.

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TELOPH

ASE

Chromosomes disorganize and

the nuclear membrane

begins to reform.

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CYTO

KIN

ESIS

The division of the cell cytoplasm, usually beginning during Telophase and finalizing the production of two new daughter cells.

Each new cell will have about ½ of the cytoplasm and organelles of the parent cell.

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CLEAVAGE FURROW VS.

CELL PLATEANIMAL

Cleavage furrow indentation of the cell membrane to form two separate

cells

PlantsCell plate

A cell wall is rigid and cannot flexibly move and pinch together

to separate the newly formed cells. So, a cell plate forms

between the two new cells. This cell plate will harden and become

a cell wall for each.

CYTO

KIN

ESIS

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CLEAVAGE FURROW VS.

CELL PLATE

REMEMBER: Interphase Prophase Metaphase Anaphase Telophase Cytokinesis

I PLAY MUSIC AT THE CLUB11/01/11

I P M A T C

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MUSICAL CHAIRS

Anim

al Mitosis -- R

eviewInterphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

Plant Mitosis -- R

eviewInterphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

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Y

EXIT TICKET:

Identify the following:• X• Y• Stage of the cell cycle