CHAPTER 9
Section 9.1: All Cells Come From Cells

Virchow: ____________________________________________
(“Where a cell exists, there must have been a preexisting cell”)
o The ___________________________________________
enables _____________ things to

_______________________,

_________________, and

_______________________
Repair and Growth:

Your ________________________________________________,
the layer underneath is __________________________________.
o The new skin cells then ______________________________
______________that are constantly ___________________
o When your ___________________, additional
_______________________________________________

_____________________________________________________
_____________________________________________________
o ________________________ in your body began with a
______________________________________.
Reproduction:

Cells also _____________________________________________
___________________or ____________________.

Some organisms reproduce by _____________________________,
in which ______________________________________________
_______________ and then ______________________________,
____________________________ (same genes) ____________
o This process is known as ___________________________.
o ________________________ of asexual reproduction
therefore _______________________________________
_______________________________________________
o ___________________________________ usually
________________________, and therefore the
_______________________________________________
o _________________________ can also reproduce this way
________________:

Starfish, when divided into two pieces, can
_________________________________________
through _____________________________

______________________________________
______________________________________

When ____________________ are involved in the _____________
_____________________________, the process is called
_____________________________________
o __________________________ from each of
_________________________________, producing
______________________________________ from either
parent
o Involves the __________________, such as an egg and sperm
o Most _____________________________________ this way
o ALL MULTICELLULAR ORGANISMS DEPEND ON CELL
DIVISION FOR GROWTH (asexual)—Sexual reproduction is
for making offspring
Concept Check (Page 181)
1. Relate cell reproduction to the replacement of skin cells.
2. Describe two ways in which asexual and sexual reproduction differ.
a.
b.
3. How is cell division involved in growth?
Section 9.2: The Cell Cycle Multiplies Cells
Chromosomes and Cell Division:

Almost all of the _________________ of a ___________________
are __________________________________________________
o Most of the time, this ______________________________
___________________ of _________________________
that ___________________________ under a light microscope

These _____________________________________:
a combination of ______________________________
o As a cell ___________________________, its __________
___________________________, becoming ____________
as the compact structures called ______________________

(Remember: _________________________________)
o The _______________________________ an organism has
________________________________

__________________________________________
o Each chromosome may ______________________________

______________________________ begins, ________________
_____________________________________
o Each chromosome _________________________________
_________________ of “______________” chromatids

The _______________________________________
_______________ is called the _________________
DIAGRAM: