Turn in MITOSIS lab paper
TOPIC:
MT 15,
Reproduction of Life
Mon
02.04.13
MY GOAL: I will understand the purpose of
MEIosis
DID YOU
KNOW?
1. About the size of a grain of sand, the
human egg is the largest cell in the human
body. (60microns)
(25400 microns/inch) (this . = 615 microns!)
2. In contrast to the egg, sperm are the
smallest cells in the body. (3microns)
3. Eggs and sperm are called gametes or germ cells
until fertilization  then a fertilized egg is called a
zygote
MITOSIS LAB  TIME SPENT IN EACH PHASE OF THE
M
P
A
I
I I I I
M
A
I
T
I
I
I I
Total Cells = 16





Interphase = 10 = 10/16 = 63%
Prophase = 1 = 1/16 = 6%
Metaphase = 2 = 2/16 = 12.5%
Anaphase = 2 = 2/16 = 12.5%
Telophase = 1 = 1/16 = 6%
% of Cells in Each Phase
CELL CYCLE
Inter Pro Meta Ana Telo
SO, now the question
is...
•Why is Interphase soooo long?
•Cell Growth
•DNA Replication
Review MiniSummative #1
Types of Reproduction & Mitosis
1.If you have not taken, step outside… Come
in today during Office Hours to take.
2.Look at MiniSum… review answers
 Analyze
ALL of this graph  What phase is
the longest according to this graph?
STOP THINK AND REVIEW
Movin’ on…
We’ve talked about MITosis, which is
reproduction of somatic cells for Growth
& Repair of tissues…
.
NOW we move on to MEIosis, which is
production of gametes!
Diploid
Diploid
Diploid
Diploid
Haploid
MEIOSIS
2 pair of
Xsomes
Replication
Cell divides
& xsomes
shuffled
during
division
Cells divide AGAIN to get sperm & egg with correct # of Xsomes
End up w/ 4 cells
w/1/2 # of
Xomes as parent
cell
(
egg
sperm
23 +
23
ZYGOTE
=
46
)
ISN P.138 
MITOSIS
ISN p.140 
Meiosis
(n = 23)
Diploid(2n)
46
xsomes
46
(n = 23)
Diploid(2n)
xsomes
46 
46 
DNA
Replication!
(92)
46
Diploid(2n)
46
(92)
46
46
Haploid (n)
23
Prod. somatic/body cells like
Skin, blood, bone cells, etc.
For GROWTH & REPAIR
(2n)
Diploid
23
23
23
Result = . Haploid sperm/egg
cells = gametes w/ ½ # Xsomes
YOUR JOB TODAY
COMPLETE ISN PAGE 141
Flow Chart, MEIosis
1. Briefly describe what is happening
OVERALL in each phase.
2. NOTE – 1st cell in Interphase is a
‘regular cell’ growing
MEIOSIS ANIMATION

Compare with your notes on ISN page 90
http://www.sumanasinc.com/webcontent/an
isamples/majorsbiology/meiosis.html
Interphase
Prophase 1
Prophase 2
Metaphase 1 Anaphase 1 Telophase 1 Cytokinesis
Metaphase 2
Telophase 2
Cytokinesis
STOP THINK AND REFLECT

1.
2.
3.
4.
5.
6.
MEIOSIS
Results in4__(#) cells w/ ½ the # of Xsomes as
orig. cell
If a cell entering meiosis has 12 Xsomes, each
6 Xsomes
of the resulting cells will have __
Gametes/germ
The resulting cells are called
____________cells
(sex
cells)
The human male sperm with ___
23 (#) Xomses &
the female egg
___ that also has 23 Xsomes could
zygote
then join to form a _______.
46 (#)
The resulting human zygote has ____
diploid number.
Xsomes, which is called the ________
The PROCESS that forms a zygote is called
___________
fertilization
HOMEWORK
• Complete
Comparison Chart in
ISN (last page of
packet)
Be the change you wish to see in the world