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1. Meiotic division of microsporocyte develops synchronously in each microsporangium of an anther.

2. After a meiotic reduction in chromosome number sporozoites are formed within the oocyst.

3. The normal rates of meiotic spindle and chromosome were 82 % and 86 % respectively.

4. Results : The configurations of meiotic spindle chromosome can be observed clearly by LSCM.

5. Reduction division --- The first meiotic division, so called because at this stage the chromosome number per cell is reduced from diploid to haploid.

6. The expression of genes are subject to meiotic sex-chromosome inactivation(MSCI) during spermatogenesis, but lots of gene transcripts are reactivated in postmeiotic.

7. The main meiotic chromosomal aberration of PMC are multipolar division, loose pairing, inversion, tetravalent, interlocking chromosome, unequal segregation, straggling chromosome, bridge and laggards.

8. It followed a normal course up to first meiotic metaphase when it inexplicably failed.

9. In wheat, during meiotic division, H3 phosphorylation initiated in special domains at the transition from leptotene to zygotene.

10. Or, to put it another way, genes that foil meiotic drivers will spread as surely as meiotic drivers will spread.

11. Considering their expression pattern, the possible involvement of this gene in meiotic and postmeiotic processes has been suggested.

12. Results:Among the 54 cases there were 45 cases with meiotic arrest in pachytene stage, 6 univalent cases, 2 multi valent cases and 1 case with normal meiosis.

13. In dandelion ( Taraxacum ), for example, the chromosomes of the megaspore mother cell remain in one cell after the first meiotic division, forming a restitution nucleus.

14. Despite the obvious clinical significance of human male infertility, the mechanisms of spermatogenic failure caused by meiotic recombination errors in humans are inadequately known at present.

15. Conclusion(s): Defects in chromosome synapsis and decreased recombination during meiotic prophase may be a important factor in spermatogenesis obstruction .

16. Conclusion: The twin girls originate from dizygotic and the extra chromosome 21 of the elder sister is from nondisjunction during the first meiotic division of the mother.

17. The chiasmata observed during the later stages of the meiotic prophase are cytological evidence of earlier cross-over events.

18. The results indicated that nutria oocytes, like other rodent oocytes, can be matured in vitro, complete first meiotic division and discharge first polar body.

19. At a species - specific later point , a final ripening ( ovulation ) and the first meiotic division occur.

20. Thesecond polar body can be seen to be expelled in the second meiotic division of ovocyte.

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21. The oocytes release from the MII arrest complete the meiotic division till fertilization or parthenogenetic activation.

22. Ethrel, at concentrations of 1.0-2.0% (W/V), caused maximum sterility of the spikelet and pollen of the rice when it was applied in meiotic stage.

23. Our results reveal that LGN is cortically polarized in mouse oocytes and is critical for meiotic spindle organization.

24. Using the serum-free culture technique for pig oocyte, the inhibitory effect of hypoxanthine (HX) on the spontaneous meiotic maturation of porcine oocytes was investigated.