What happens during crossing over?
Tetrads separate and produce two haploid daughter cells.
Homologous chromosomes trade pieces of DNA.
Sister chromatids form tetrads and line up randomly.
Spindle fibers form and attach to centromeres.
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Crossing over is the process in which there is exchange of genetic material between the non sister chromatids of the homologous chromosomes that produce new combinations of alleles in daughter cells. So the right answer to the above question is that during crossing over homologous chromosomes trade pieces of DNA. Crossing over provides raw material for the variations in life form that is major significance of meiosis.
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