crossing over

Started by elz787
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elz787

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so on this subject test it says crossing over takes place during prophase I, but then during metaphase I homologous recombination occurs so is it both? or....?
 
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Crossing over occurs during prophase I. A synapotnemal complex complex forms joining the homologous chromosomes during synapsis, (when the chromosomes "come to lie lengthwise side by side." ) During late prophase the chromosomes are held together only at regions called "chiasmata," according to my bio book. Each chiasma originates at a crossing-over site. This is also genetic recomibination- "genetic recombination" refers to the new combinations of genes produced from crossing over. I don't know why it says that recombination occurs during metaphase I, as far as I know that is incorrect.
 
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