IB BIO 10.1- Meiosis
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Transcript of IB BIO 10.1- Meiosis
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10.1- MeiosisYoel Alperin and Hill Belfi
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Meiosis he !eduction of the nucleus to form haploid gametes"
#A$%! DI&&'!'NC'( NOT A CYCLE
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Chromosome Descriptions
)I*A+'N
,AI! %& SIS'! CH!%#%S%#'S
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Prophase I
Nuclear membrane dissolves
Centrioles move to the poles
Homologous chromosomes associate and and become bivalent
Crossing over and synapsis
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Crossing Over
/0 Synapsis- homologous chromosomes associate
10 Chiasma &ormation- neighboring non-sister chromatids are exchanged
20 !ecombination-alleles are swapped
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Linked enes Diagram
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!nimation
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3456/775484995:)iolH+:Damon3Animations3ch/9p7773index"html
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Metaphase I
!andom orientation occurs along e;uator
89< chance of going to a particular pole =Independent of each other0
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(orld Conte)t
his section has shown multiple ways in which nature tries to
increase variety in populations and we have seen the power of
variation in natural selection" Despite our understanding of the
importance of variation for natural selection biodiversity and for ourhealth countries all over the world are reducing the variety of crops
they plant and are replacing balanced ecosystems with
monocultures" Are such practices sustainableB Could reducing
variety in the foods we grow and eat increase ris>s of famine and
other global health crisesB