1. Significance.- At Chiasmata crossing over occurs in pachytene stage

2. The Chiasmata becomes visible during the pachytene stage of prophase I.

3. Significance: At Chiasmata crossing over occurs in the pachytene stage.

4. As in the spermatocyte of the pachytene stage, the majority of nucleolar chromosomes, in the oöcyte, are acrocentric.

5. The absence of normal Sertoli-spermatocyte interactions in in vitro incubations may also limit dolichol synthesis in the pachytene spermatocyte.

6. BAC clones corresponding to telomeres, as well as to the centromere position and the gap sizes between contigs, were determined by BAC-pachytene chromosome fluorescence in situ hybridization (FISH).