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hbio
ch. 10
meiosis
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the first
meiotic division
creates
2 daughter cells
with
23 chromosomes
each (
46 chromosomes
)
during prophase 1,
chromosomes
become
visible
as
long
threads
and form
homologous
pairs
,
crossing
over
occurs. pairs
move
towards
spindle
fibres
during metaphase 1,
chromosomes
are arranged on
spindle
fibres
across
equator
during anaphase 1, pairs of
homologous
chromosomes
move
apart
, so there are
23
chromosomes
at each
pole
during telophase 1,
chromosomes decondense
and the
nuclear membranes
may
reform
cytokinesis
occurs and creates
2
daughter
cells
the second meiotic division creates
4 haploid cells
with
23
chromosomes
each (
23 chromatids
)
in prophase 2, new
spindle
fibres
form at each end of
original
and usually at
right angles
to
original
,
chromosomes
gradually
move
towards
equator
in metaphase 2,
chromosomes
arranged on
new spindle
and
centromeres divide
, each
chromatid
is now a
separate chromosome
in anaphase 2,
chromosomes
migrate
towards
opposite
poles
in telophase 2, the
nuclear membrane
forms