Unformatted text preview: ry(Fission( Daughter!cells!are!usually!gene8cally!
iden8cal!(excep8on!–!muta8on)! SEX CELLS (GAMETES) HAVE 23 CHROMOSOMES!
AUTOSOMAL CELLS HAVE 46. Sexual(Reproduc8on(( *! Gametes are genetically DIFFERENT from each other
! AND the parents
Blue!chromosome!from!male!parent! attached by
cohesin molecules *! Diploid cell with replicated
ARMS here No!replica8on!of!chromosomes!between!
separate! *! *! One gamete gets one
of the homologs and the
other gets the other one
now you have a HAPLOID
cell w/ replicated
chromosomes! now cohesin
Now you have HAPLOID cell wi/ UNREPLICATED
! Crossover between NONSISTER chromatid of homologs
*!takes plae while homologs are in synapsis. (where they cross
! over is called a CHIASMATA) - this is important - if no crossing
over occurs, they can't move around as pairs - it attaches them!
*! Homologs are still associated due to sister chromatid cohesion
! Meiosis(I:((Separa;on(of(Homologous(Chromosomes( Metaphase(I(
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- Spring '14