Abstract
CROSSING over probably occurs at pachytene, and is subsequently seen as chiasmata1. In microsporocytes of Lilium, a repair synthesis of about 0.1% of the nuclear DNA occurs at this stage, separate from the pre-meiotic S-phase synthesis2. As pachytene synthesis and crossing over seem to occur at the same time, the synthesis may reflect limited repair at the breakpoints of DNA molecules involved in crossing over3.
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SMYTH, D., STERN, H. Repeated DNA synthesized during Pachytene in Lilium henryi. Nature New Biology 245, 94–96 (1973). https://doi.org/10.1038/newbio245094a0
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DOI: https://doi.org/10.1038/newbio245094a0
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