Transcript ENGAGE: You`re the doctor. What would you tell your

Why Cells Divide
M. L. Hatter
Young Women’s
Preparatory Academy
ENGAGE: Think, Pair, Share
You are the Doctor
• Review the
information on the
next slide.
• Write in your
journal 2-3 things
you would tell your
patients and the
reasons for your
suggestions.
ENGAGE: You’re the Doctor.
What would you tell your patients?
Patient #
Gender
Age
Weight
Heart
Rate
Blood
Pressure
Energy
Level
(beats/min)
#1
Male
40
210
95
High
Low
#2
Male
40
185
70
Normal
High
Doctor’s Advice
Patient #2
• Everything is going
well.
• Keep doing what
you’re doing.
• See you next year.
Patient #1
• Lose weight
• Exercise
• Prescription for
lowering you blood
pressure.
• Need to see you next
month.
EXPLORE: What happens when a
cell gets too big?
1) Make a sketch of a
cell in your journal.
2) Next describe and
make another sketch
to show what would
happen to the cell if
it got too big.
Our cell is too big!
• Cell functions slows
down.
• Waste products build
up.
• DNA overloaded.
WHAT SHOULD
WE DO?
Our Solution: The cell must divide.
• Before a cell can
divide, it must first
duplicate its DNA!
DNA REPLICATION
DNA Replication Occurs in the
S-Phase of the Cell Cycle
Mitosis (Division of the cell
nucleus)
Cytokinesis
The process by which the cytoplasm divides and one cell
becomes two individual cells. The process is different in plants
and animals
Animals - cell pinches inward (forms a cleavage furrow).
Plants - a new cell wall forms between the two new cells
(forms a cell plate).
Key Terms
• Chromatin: Uncoiled DNA
• Chromosome: Coiled DNA (DNA with a
copy of itself).
• Chromatid: ½ of a chromosome
• Centromere: Connects two chromatids
together to make a chromosome.
• Centrioles: Organelles used in cell division
to move chromosomes to opposite sides
of the cell.
More Key Terms
• Mitosis: Normal cell division
• Meiosis: Special cell division that creates
the sperm and eggs.
• Daughter Cell(s): The new cells produced
by cell division.
Chromatin(DNA) to
Chromosome