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Monday, Jan. 6. Standard 6 Notes/discuss 10.1 Surface area lab. Seating Chart (change =referral). Cell Growth. When living things grow, what happens to it’s cells? Does an organism get larger because each cell increases in size or because it produces more of them???? Stem Cell. - PowerPoint PPT Presentation
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STANDARD 6NOTES/DISCUSS 10 .1SURFACE AREA LAB
Monday, Jan. 6
Seating Chart (change=referral)
Nathan McCown
Ashley Schlemmer
HaleyHickert
Justus Warner
Tracie McCleese
JeffreyFinicle
Devin Holmes
Quentin Pier
ClayHinrichsen
KaitlinPartenheimer
Nic Cisneros
Nicole Ward
Taylor Castle DavidSiler
WyattHelfin
Alex Harmon
Cell Growth
When living things grow, what happens to it’s cells? Does an organism get larger because each cell
increases in size or because it produces more of them????
Stem Cell
Limits to Cell Size
Most cells divide after growing to a certain point Why???
Information “overload” Larger cell would make greater demands on genetic
“library” (DNA) DNA would no longer be able to serve the needs of the
growing cell- build a new “library”Exchanging materials
A decrease in the relative amount of cell membrane available (surface area) creates serious problems
Surface area to volume ratio in cells
Not enough substances getting in cellNot enough waste getting out of cellHeat build up in cell
Cell division
The process by which a cell divides into two new daughter cells Cell replicates all of its DNA first Reduces cell volume, increases ratio of SA to V=
efficient exchange of materials
Cell reproduction
Asexual Genetically identical From a single parent Simple, efficient, effective
Sexual Inherit some genetic info from TWO parents Creates genetic diversity
Sexual Asexual
Requires more time- find mate, growth ad development
Can be advantage due to seasonal changes, food availability
Genetic diversity- equipped for change in environment
Survival strategy for single-celled organisms
Faster they reproduce the better their chance of survival
Lack of genetic diversity is a disadvantage- not equipped for change in environment
Comparison
READING QUIZ 10 .1NOTES/DISCUSS 10 .2ONION ROOT TIP LAB
HW: MITOSIS WORKSHEET
Tuesday, Jan. 7
Chromosomes
What if a cell were simply split in two?? DNA needs to be replicated first; cell can’t function
with ½ of it’s DNAGenetic info is bundled into packages of DNA
known as chromosomes.Chromatin= DNA+protein, uncoiled chromosomes
Chromosome= supercoiled chromatin
Prokaryotic Chromo Eukaryotic Chromo
Single chromoCircularIn cytoplasm- no
nucleus
Multiple chromosHistones- protein that
DNA coils aroundMake it possible to
separate DNA precisely during cell division
Compare
The Cell Cycle
Cells grow, prepare for division, and divide to form two daughter cells
Prokaryotic cell cycle Eukaryotic cell cycle
Binary fission- single-celled produces two genetically identical organisms
Four phases: G1, S, G2, and M.
Compare
Eukaryotic Cell Cycle
G1 phase: cell growth Increase in size, synthesize new proteins and organelles “G” stands for “gap”
S phase: DNA replication “S” stands for “synthesis” New DNA is synthesized when DNA replicates At end of S phase, cell has double the DNA
G2 phase: preparation for mitosis Shortest phase Organelles and molecules needed for cell division are produced
M phase: Cell division Produces two daughter cells Involves two processes: mitosis and cytokinesis M for “mitosis” Takes place quickly
Interphase
Mitosis (P-MAT)
Prophase Genetic material condenses, becomes visible Spindle fibers form outside nucleus Nucleolus disappears and nuclear membrane breaks down
Metaphase Centromeres line up in center of nucleus Spindle fibers connect to centromere
Anaphase Chromosomes separate and move along spindle fibers to
opposite ends of cell (poles)Telophase
The chromos go back to being spread out (chromatin) Nuclear membrane and nucleolus re-form in each daughter cell
Cytokinesis
Ends M phaseDivision of the cytoplasmOccurs at same point in time as telophaseIn plants:
Cell plate develops between two nuclei Cell plate gradually becomes cell membrane, the cell
wall formedIn animals:
Cell membrane drawn inward “pinches” into two equal parts
COLLECT MITOSIS HWINTRODUCE STOP-ACTION FILM
Wednesday, Jan. 8
iPhoto (on launch pad)
Take 10 separate images of an object, moving it an inch farther for each new photo
CREATE STORYBOARD(USE RUBRIC)
Thursday, Jan. 9
FINISH STORYBOARDBEGIN CREATING “SCENES”
Friday, Jan. 10