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Summary Alevel OCR Biology A notes on Cell Division
Alevel OCR Biology A notes on Cell Division from an A* biology student.
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nuclear↳ miNsis
division all
duson
gloliness
sphase =
62
DNA replication
-
7
m
↑
cell division Interphase
61
phase of
-
cycling trigger movement from each thea l l cycle.
-Interphase G,
=
=
cells make RNA, enzymes other proting
+
for growth
growth of
=S phase DNA nucleus
multicellent
retr replicates
in
=
G2
=
replace cells cell continues to
glow new DNA
synthesised checked, error repaired
=
+
is
and repair r
tissues
Mitosis 1 genetically identical daughter
-
ally produced
=
L
asexual
=
Prophase chromosomes condence, I sister chromatics join at centromere, a controsomes
=
reproduction
move to opposite poles, spindle fibres emerge from centrosomes, ruler envelope
break down into small locks, wallows disappeal
-Metaphase: aurrosaries at opposite
poles, spindle fibres extend, chromosomes line
up at
equator, spindle fibres attach to centromeres
=
Anaphase =
sister chromatic separate
at centromere, spiridle fibres shown, chromosomes
to
pullace opposite
poles.
=Telophase chronoscres decondence, nuclear envelopes reform around each of chromo-
=
set
scree, spindle fibres break down, new nucleoliform each
in all
-
checkpoints
DNA DNA
=
ceded for errors
=proot reading +
repair enzymes
=During G, chromosomes ceded for damage, damage:t o s
phase until repaired
=
During Sphase chromosomes declect been replicated, replication
-
=
to ensure theyve
cell
insuccesful: cycle stopped.
=During 62 damage check after
phase:additional DNA occurs replication,
DNA
cycle
delayed until repair made.
-During final check:
metaphase: chromosomes
correctly attached to spiridle fibres prior
anaphase.
to
Meiosis= diploid
-
nuclear division= ->
haploid cells gametes for sexual reproduction
-
=Prophase I dna
=
concesses, nuclear envelope break down, spindles form, crossing our
=Metaphase I line up at
=
equator, maternal paternal
+
chronosces each
in pair position
differently (independent assortment).
dont divide.
=
I :chromosomes
Anaphase separated, centromeres
-Telophase I "same"
=
cytolinesis
-
=
cytoplasm dision, a haploid cells
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