The Mitosis: Steps/Stages of cell division

Interphase	(VIDEO: allez en bas de page: Scroll down) a step : a stage : une étape    The cell is engaged in metabolic activity. It is preparing for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes cannot be clearly identified the nucleus, although a dark spot called the nucleolus may be visible. The cell may contain a pair of centrioles (or microtubule organizing centers in plants).
Prophase	Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes. The nucleolus disappears. Centrioles begin moving to opposite ends of the cell and fibers extend from the centromeres.
Prometaphase	The nuclear membrane dissolves: It's the beginning of prometaphase. Proteins attach to the centromeres: It creates the kinetochores. Microtubules attach to the kinetochores and the chromosomes begin moving.
Metaphase	Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.
Anaphase	The paired chromosomes separate at the kinetochores and move to opposite sides of the cell. Motion results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.
Telophase	Chromatids arrive at opposite poles of cell, and new membranes form around the daughter nuclei. The chromosomes disperse and are no longer visible under the light microscope. The spindle fibers disperse, and cytokinesis (= The partitioning of the cell) may also begin during this stage.
Cytokinesis	In animal cells, cytokinesis results when a fiber ring (composed of a protein called actin around the center of the cell) contracts. That contraction pinches the cell into two daughter cells, each with one nucleus.  ANIMATION :

WORKSHEET: MITOSIS ANIMATION #1

Mitosis is like a dance!

I. Introduction: a step = a stage ( = a phase)

There are ______ steps which are called “______________________________________________

____________________________________________________________________________.”

II. The steps explained:

1. First, the key is a C_____________ in which there's a C_____________ composed of a C___________________ and a C__________________ !

Make a sketch here:

1. Then, there is a phase called “_________________” because the cell prepares.
   During this phase, the membrane around the N___________ , called “ N____________ M_______________”.
   The membrane ______________ _____.
   The C______________ become more compact ( = more C_____________ ) and
   the C________________ move to opposite ends ( = poles).

Make a sketch here:

2. Next, there's a new phase which is a M_____________ phase called “_______________ because the C____________ line up or meet in the M____________ of the C___________. The C______________ still are at the opposite ends and the S__________ F____________ attach (or link) the C____________ to the P__________/opposite E_______.

Make a sketch here:

3. After that, there's a phase called “________________” because the different elements are A______________. Now the F___________ become shorter and as a consequence, the C________________ go to the P_______________.

Make a sketch here:

4. Finally, the last phase called “________________” starts, which means T__________ because the division takes place. The separation is a process and is also called “C__________________S”. The cell gets bigger before it can split in two!

Make a sketch here: