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Name:_______________
Date:________________
Class:_______________
Lesson 8
Cell Division Notes
Multiply, Divide and Survive
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______________ allows scientist to observe cells in different stages of their life
cycle as they grow and divide
studies allowed scientists to determine that most cells containing nuclei undergo a
series of steps called ___________ or _____________ to divide into two cells
o these two stages are collectively called ______ __________
observations where also made on rod-shaped structures in the nuclei called
_______________ that appear just before a cell splits
o _______________ are composed of ________, which contain all of the
hereditary information for each organism
Pairing Up
 chromosomes occur in _________
o the number of pairs varies among organisms
o all members of the _________ species have a unique number
 you might expect that complex organisms would have a ___________ number of
chromosome pairs than a simple organism
o however, this is NOT the case
o complex humans have _______ pairs, where simple rose plants have
_______ pairs
 hereditary units called _____________ appear in the same locations on both
chromosomes of each pair
Going in Circles
 a cell’s life cycle has stages or phases
 when a cell is not dividing it is in a stage called __________________
o during this phase:
o cells are busy carrying on their life processes, which include
________________
o ________________ are not visible, they are elongated and blend in with
the nuclear material
 when elongated and not visible they are referred to as
_________________
 DNA, that makes up the _____________ duplicates during this
phase
o near the end of _________________ , the cell makes final preparations for
mitosis by producing necessary organelles for each daughter cell
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_________________ is a series of phases during which the DNA first
__________ and ________________ into chromosomes
o chromosomes _____________ from each other and _______________
into the nuclei of what will soon become two new cells
 the new cells are called _____________ ___________
has four stages that are continuous
1. ______________________
2. ______________________
3. ______________________
4. ______________________
Prophase
 _________________ begin to coil, shorten and become thicker
o they are then referred to as ________________, and are visible
 centrioles produce a mesh-like structure of fine, ___________ _____________
 ___________ _______________ disintegrates, fibers guide movement of
chromosomes toward the ____________ of the cell
Metaphase
 ___________________ line up in the middle of the cell
 ___________________, place where duplicated chromosomes are attached, align
in middle of the cell
Anaphase
 duplicated chromosomes separate
 each become _______________ chromosomes
 fibers shorten drawing chromosomes to ____________ ends of the cell
Telophase
 chromosomes at opposite ends of the cell
 chromosomes _____________ and ______________, and begin to blend into
nuclear material
 _____________ _______________ forms around each nucleus
 fibers breakdown and disappear
 mitosis is complete
 daughter cells are in __________________
 both nuclei are ________________, therefore _______ or _________
___________ are identical
Final Step
 _________________ occurs
 splitting of daughter cells
 different in ___________ and ____________ cells
o in an _____________ cell, membrane pinches inward to form two
daughter cells
o in ______________ cell, cell plate forms in the middle of cell until it
becomes part of the cell wall
The Cell Cycle
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