Synapsis VS Crossing over
Synapsis happens at prophase of meiosis I. It refers to the homologous choromosomes coming close together. Chiasma formation then takes place and bivalents are then formed.Crossing over refers to the breakage and rejoining of segments of non-sister chromatids during prohase (of meiosis I) after bivalents are formed.
As such, synapsis is not equivalent to crossing over.
The pairing (formation of bivalents) allows crossing over to take place and this enables genetic variations in the gametes.
MG
posted by MG-Biology @ 10:32 PM
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