PreLecture 6 chromosomes_mitosis_1to20 by UPAD

Gcomparingthechromosomesin

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 a"er
DNA
replica?on
 Chromosomes
are
comprised
of
sister
chroma?ds
only
 
 
 
 
 
 
a"er
DNA
replica?on 
 
 
 
 
(Goal
6)
 3’
 5’
 3’
 5’
 One
chromosome
 (unreplicated)
 G1 stage of cell cycle 3’
 5’
 3’
 DNA
gets
 replicated
 S stage of cell cycle One
chromosome
 (replicated)
 G2 stage of cell cycle Chromosomes
are
comprised
of
sister
chroma?ds
only
a"er
DNA
 replica?on
 Telomere
 Telomere
 Sister
chroma8ds
are
 held
together
8ghtly
by
 special
proteins
that
bind
 to
their
centromere
 region

 Sister
chroma8ds
 =
one
chromosome
aLer
DNA
replica8on
 Human
chromosomes
aWer
DNA
replica?on


(Goal
3)
 The
two
chromosome
6’s
 are
homologs
 (=homologous)
 Picture
of
chromosome
 6
inherited
from
dad
 Picture
of
 chromosome
6
 inherited
from
 mom
 Models
of
chromosomes
comprised
of
sister
chroma?ds
 Many
ways
to
represent
chromosomes
that
are
compris...
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