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Mitosis Notes:
KEY WORDS/
QUESTIONS
PROKARYOTIC CELL
DIVISION (7.1):
Chapter 7
NOTES
*All bacteria (examples)
*Binary Fission
http://www.classzone.com/books/hs/ca/sc/bio_07/animated_biology/bio_ch05_01
49_ab_fission.html
*Replication happens just like we learned on our last notes.
Cell Cycle: (7.2)
A:
B:
EUKARYOTES
ONLY
C:
D:
I:
EI:
AC:
I
Identify the name of each stage and tell me what is
happening there.
Chromosomes (7.3)
The G0 phase (Coming off of “A”) as the cell retirement
home, where some cells divide once and then never again.
http://www.cellsalive.com/cell_cycle.htm
http://www.cell-action.com/cell_cycle/cell_cycle.html
AMAZING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!
Chromosome Number:
The amount of DNA an organism has does not correlate to
their size...some bacteria have more DNA. Our DNA,
unlike the one circular chromosome that bacteria have,
is “divided” into pieces known as chromosomes. Most of
our cells have 46 of them...one set of 23 from mom, one
set of 23 from daddy.
Key Vocab Terms:
a. Chromosome: tightly coiled lengths of DNA that
are sectioned into genes.
b. Homologous Chromosomes: two chromosomes that have
the same genes, in the same order, are the same
size, have their centromere in the same location,
and have the same banding pattern (see karyotype)
Mitosis Notes:
Chapter 7
c. Diploid: Cells that have two sets of DNA – one
set from each parent. Often designated as
2n...where n stands for the amount of DNA in a set
and the 2 means you have 2 sets.
d. Haploid: Cells that have one set of DNA. Often
designated as “n”. AKA gametes
e. Somatic Cell: AKA body cells – any diploid cell
f. Sister chromatids: Identical copies of
chromosomes attached at centromeres.
Karyotypes:
a “picture”
of all the
DNA in one
cell...scientists can use them to determine if there are
any problems!
Chromosome structure:
DNA coiled around histone proteins. Must occur b/c nucleus
disappears and cells need to protect their DNA from getting
destroyed by all the bad guys in the cytoplasm.
Mitosis (149151):
This is the
original cell.
Show what it
would look like
in G1 with six
chromosomes.
Label each of the phases and show what happens to the
six chromosomes during mitosis.
Mitosis Notes:
Cytokinesis
Meiosis (153155):
Chapter 7
Nothing special...do what you always do!
http://www.hybridmedicalanimation.com/anim_mitosis.html
Definition: division of cytoplasm and organelles to
each new cell.
Plants: cell plate forms
Animals: cleavage furrow forms
Label each of the phases and show what happens to the
six chromosomes during mitosis.
This is the
original cell.
Show what it
would look like
in G1 with six
chromosomes.
http://www.sumanasinc.com/webcontent/animations/content/meiosis.htm
l
http://www.pbs.org/wgbh/nova/miracle/divide.html - AWESOME!!!!
Key to discuss: crossing over, alignment at metaphase
Mitosis Notes:
Meiosis/Mitosis
Summary:
Chapter 7
1. What is different about mitosis vs. meiosis during
prophase?
2. What is different about mitosis vs. meiosis during
metaphase?