Elimination of Chromosomes during Cleavage in the Eggs of Sciara (Diptera)
- 1 May 1932
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 18 (5) , 352-356
- https://doi.org/10.1073/pnas.18.5.352
Abstract
S. coprophila shows 7 [male] and 8 [female] somatic chromosomes, while spermatogonia and oogonia have the 8 "ordinary" [female] somatic chromosomes with 1 or 2 V-shaped "limited" chromosomes. Oocytes have 4 ordinary and one or no limited chromosomes. Sperma-tocytes have 5 ordinary chromosomes, the 5th being a supplementary rod, and 1 or 2 limited chromosomes which are not reduced at the 2nd maturation division. Fertilized eggs have 9 ordinary and 1, 2, or 3 limited chromosomes. In the 5th cleavage 2 chromosomes, a rod already divided or 2 rods, stay in the spindle. The other limited chromosomes, fragmented, are eliminated in the 7th, 8th, or 9th cleavages.This publication has 1 reference indexed in Scilit:
- Differences between Chromosome Groups of Soma and Germ-Line in SciaraProceedings of the National Academy of Sciences, 1931