prophase i.pptx
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Biology
MEIOSIS 1
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Interphase
Chromosomesreplicate to form
sisterchromatids
Chromosomes
are not visible. Centriolereplicates.
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Prophase 1
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Prophase 1
• Chromosomes coil and become
shorter, thicker and visible under the light microscope.
• Homologous chromosomes
come together to form bivalents by synapsis forming a tetrad (Each pair, ith four chromatids!
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Prophase 1•
Synapsis – the pairing ofhomologous
chromosomes
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Prophase 1: rossingover
hromatidse!changeportions oftheirchromatidsat
chiasmata"
• "on#sister chromatids e$change
genetic material through the process ofcrossing over.
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rossing over
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•entrioles move toopposite poles ithspindle #bres beteenthem.
•
$ucleolus and nuclearenvelope disappear"
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