- Microsporeabortionoccurredafterthetetradformation.Attetradstage,dyad,triad,tetradwithmicronucleusandpolyadappeared.Megasporetetradislinear.ThechalazalmegasporedevelopsintoanembryosacofPolygonumtype.Atthispointeschchromosomeconsistofapairofchromatidsa...
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