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Chapter 15 (meiosis (reduction division (meiosis division (prophase 1…
Chapter 15
meiosis
reduction division
meiosis division
metaphase 1
tetrads center towards cell
metaphase plate
anaphase 1
chromosomes begin to seperate
cohesin not digested
prophase 1
pachytene
chromosomes are shorter and thicker
crossing over occurs
diplotene
become tangled by chiasmata
tetrads become visible
bivalents begin to move away
zygotene
pairing of chromosomes occurs
synapses are involved, bivalence
homologous chromosomes
diakinesis
untangling begins to happen
homologous
chromosomes condense
nucleolus and nuclear membrane begin to break down
telophase 1
chromosomes begine to uncoil
no DNA replication occurs
cytokinesis begins to occur
meiosis ii
if the telophase happens to occur
metaphase II
short process
anaphase II
seperates chromosomes from the replicates
telophase II
new nuclei is formed
prophase II
#
gets the nucleus started for division
the sex cells from a zygote
Growth phase of the cell cycle
#
S Phase
S for division
this is a sequence that is unlike any of the other phases
telomeres
histones and centomeres
chromosomes
chromatids are involved in this process as well
gene amplification is
genes are repliateed
this means that all chromosomes are replicated
the second phase of the process
G2 phase occurs
contains A and B tubulins at work
spindle microtubles are at work here
Lasts a few hours
g1 phase
synthesis of nucleotides
this is the cell cycles longest stage
g1 phase
1st phase after cell division
division of the cell
division of the nucleus
called karyokinesis
cytoplasm division
called cytokinesis
Mitosis
#
prophase
Prophase
chromosomes condense
kinetocore
spindle
chromosome condensation happens
opposite poles seperate
anaphase
begins after cohesin digestion completes
spindles begin to shorten
telophase
reversal of prophase
nuclear envelopes are formed
chromosomes begin to uncoil
cytokinesis
division of protoplast
preprophase band
plane of division becomes apparent
phragmoplast
cell plate is visible
phragosome
metaphase
chromosomes become centered
digestion of cohesin
metaphase place
prokaryote division
cytokinesis
histones are not present in prokaryote division
one or more rings of DNA present
are pulled apart as the cell grows larger and larger
much simpler than other forms of division
infurrowing
plasma membrane pulls inward
nucleus pinches in two
this effectively completes the process and the nucleus is seperated
