Download Cell Cycle

Warm-Up #16
1/25/13
1) Label pictures A, B, C with the type of DNA it is.
A
C
B
2) If an organism has 24 chromosomes in its body
cells, how many would it have in its gametes?
3) How many chromosomes would be in that
organisms skin cells?
4) Which cell will divide soon, 5:1 or 8:1 ?
5) Which cell is bigger, 15:1 or 10:1 ?
Warm-Up # 17
1/28/13
1) What is the picture showing?
2) How many cells are created during mitosis and are they
identical or different?
3) How many cells are created during mitosis and are they
identical or different?
4) What is the chromosome difference between a cell
created in mitosis versus one created in meiosis?
5) What are the 3 main parts of the cell cycle?
Sexual Vs. Asexual
Reproduction, Basics of Cancer
Essential Question
What is the difference between cancer
cells and normal body cells?
Mitosis (Body/Somatic cells) Vs.
Meiosis (Sex/ Gamete Cells)
2 cells are produced
4 cells are produced
Cells are genetically identical Cells are genetically
different
Diploid cells (2N)
Haploid cells (N)
How asexually reproducing
organisms produce a new
organism
How sexually reproducing
organisms produce
gametes
Sexual Vs. Asexual Reproduction
Oh my
goodness,
she said
sex!
2 methods of reproduction
Most multicellular organisms
reproduce sexually
Sexual – 2 cells, 1 from each parent, unite
to form the first cell (ZYGOTE) of the new
organism
Asexual – new organism has a single
parent
Sexual Reproduction
2 individuals produce offspring that have
genetic characteristics from both parents.
Occurs due to gamete formation and
fertilization.
Results in new gene combinations in a
population
The successful
sperm 
Asexual Reproduction
Three main types
Fission (budding)
Fragmentation
Regeneration
Fragmentation
The body of the parent breaks into pieces,
each of which can produce an offspring.
Ex. Planarians (a type of worm)
Fission
AKA budding
One or more individuals are formed from
the original
The offspring grows out of the body of the
parent
Can remain attached or break away
Example: hydra
 Multiple buds
on a hydra
Hydra showing a bud
and a newly formed
organism 
A single Hydra 
Regeneration
These animals can lose a body part, and
can grow a replacement part.
The lost part can regenerate into an
entirely new organism.
Two lost rays producing 3 rays
Ex. sea stars
Lost ray producing 5 rays
Sporulation
Division of spores
Reproduction involving specialized cells
coming from bacteria
Cell Cycle
Cells have different cycle lengths.
Nerve cells do not divide in an adult – long cell
cycle
Skin and digestive cells divide throughout our
lives – short cell cycle
Cyclins - group of proteins in
eukaryotic cells that help control the
timing of the cell cycle.
Cancer is often caused due to a
particular cyclin functioning
improperly.
Cancer… What is It Exactly?
Uncontrolled cell growth = CANCER.
Cancer cells do not stop dividing when
they should. This forms tumors.
Tumors cause damage to nearby healthy
tissue.
Benign Tumors = Do not spread in body
Malignant Tumors= Cancer cells
Normal cell activities are disrupted. The
whole body suffers.
Benign vs. Malignant
More likely
to be
harmless;
usually
don’t
spread.
Cancer
cells that
spread
through the
body. More
likely to
cause harm
or death.
Cancer Cells
Cancer
Cells
Among
Red
Blood
Cells

Start of a
Tumor
Leukemia
Rat with a tumor
Unit 6 Folder Check - Wednesday
 You will get the rubric for the folder TODAY
 You can turn it in tomorrow for 10 points extra
credit
 You should have:
19 warm ups
4 days of notes
Vocab Cards
Cell Cycle Diagram and Meiosis Diagram
Review sheet in front pocket
Grade stuff in back pocket
Warm-Up # 15
1/24/13
1) What is a somatic cell?
2) Why does meiosis have 2 divisions?
3) Females do not create 4 eggs during each
meiosis, what do they create?
4) What part of meiosis is this picture?