Download 9.1 All cells come from cells.

CHAPTER 10
ALL CELLS COME
FROM CELLS.
REPRODUCTION
Asexual
reproduction-produces
offspring that inherit all their
genetic material from just one
parent
 Example: Sea Stars and
Plants
REPRODUCTION CONTINUED….
Sexual
reproduction- two
parents are involved in the
production of offspring.
 Examples: Egg and Sperm
REPRODUCTION CONTINUED…
Asexual
and Sexual
Reproduction-some unicellular
and multicellular organisms
 Examples: Slime molds and
Sea Anemones
 Can you think of some reasons
why some organisms can do
both?
REPAIR AND GROWTH
Take a moment to look at the skin on your arm.
 Did you know that the outermost layer is actually
dead cells?
 New cells are gradually moving toward the
surface, replacing dead cells that have rubbed off.
 Asexual or Sexual reproduction?
 The replacement of lost or damaged cells is just
one of the important roles cells reproduction
plays in your life. Another is growth-simply
increasing in size from a baby to a child to an
adult.

THE CELL CYCLE MULTIPLIES CELLS.
 Chromosomes
and Cell Division
 1. Chromatin-a combination of DNA
and protein molecules
 2. Chromosomes-when a cell divides,
its chromatin fibers condense, becoming
visible as they compact
Human Body = Has how many
chromosomes?
Each chromosome may contain
hundreds of genes
CHROMOSOMES AND CELL DIVISION
CONTINUED…
Sister chromatids-two identical joined copies of
chromosomes.
 Centromere-the region where the two chromatids
are joined tightly together. *Draw Figure

CELL CYCLE
 Cell
Cycle-Eukaryotic cells that divide
and undergo an orderly sequence of
events.
 Interphase-the stage during which a
cell carries out its metabolic processes
and performs its functions.
The cell may spend as much as 90
percent of the cell cycle in interphase.
CELL CYCLE CONTINUED.

Cell Cycle includes =

Interphase and the M Phase (Mitosis)

Interphase is divided into:




1. G1 phase-cell grows
2. S phase-genetic material is duplicated
3. G2 phase-cell prepares to divide
4. M phase (Mitosis) is divided into
 Prophase
 Metaphase
 Anaphase
 Telophase/Cytokinesis
*Goes in order from 1 through 4.
DRAW FIGURE
MITOTIC PHASE
Mitotic
phase-the stage of
the cell cycle when the cell is
actually dividing.
 Includes two processes:
Mitosis and cytokinesis
MITOTIC PHASE CONTINUED…
Mitosis-the
nucleus and the
duplicated chromosomes
divide and are evenly
distributed forming two
“daughter” nuclei.
 Unique to eukaryotes
MITOTIC PHASE CONTINUED…
Cytokinesis-process
by
which the cytoplasm is
divided into two.
Video