PreLecture_7_meiosis(1)_1to20 by UPAD

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Unformatted text preview: homologous
 chromosomes”
stage)
in
meiocytes
from
 grasshopper
testes.
 Meiocytes
in
grasshoppers
testes
 Anaphase
(“pulling
apart”
 stage)
of
MI
 Photo
credit:

 Angie
O’Neill
and
her
BIOL240
students
 2.
Reminder:
how
meiosis
fits
into
the
cell
cycle
 G1+S+G2
=
“Interphase”
 What
happens
to
the
 chromosomes
during
 meiosis?

 M

=

M 
 
G2
 Meiosis
I
 eiosis
 
 
G1
 =
Gap
phase
2
 The
cell
grows
more
 =
Gap
phase
1
 The
cell
checks
and
 The
cell
grows
 double
checks
that
 Lots
of
transcrip:on
 everything
is
OK;
 and
transla:on
 it
gets
ready
for
 The
cell
gets
ready

 meiosis!
 S
 
to
replicate

 
DNA
synthesis
 
its
DNA
 What
happens
to
 chromosomes?
 A
cell
CANNOT
start
meiosis
un:l
it
has
cleared
the
G2
check
points.
 Wh...
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