OOGENESIS IN HABROTROCHA TRIDENS (MILNE)

¹ Zoology Department, University of Washington, Seattle, Washington

1. The pattern of chromosome behavior during egg formation in Habrotrocha tridens is the same as that found in Philodina roseola. The oocytes undergo two maturation divisions, both equational.

2. The zygoid chromosome number is 13, the same as that of Philodina roseola.

3. The pair of dot-shaped chromosomes of unequal size is found in each of these forms, though the conspicuously longer one seen in Philodina roseola (Fig. 37) cannot be identified in the present form (Fig. 36).

4. No sign of synapsis has been observed in either form.

5. The chromosomes exist in a condensed condition in the nuclei of the ovary after the last oogonial division, and remain condensed throughout at least the first maturation division.

This article has been cited by other articles:

				E. Gladyshev and M. Meselson Extreme resistance of bdelloid rotifers to ionizing radiation PNAS, April 1, 2008; 105(13): 5139 - 5144. [Abstract] [Full Text] [PDF]

				D. B. Mark Welch, J. L. Mark Welch, and M. Meselson Evidence for degenerate tetraploidy in bdelloid rotifers PNAS, April 1, 2008; 105(13): 5145 - 5149. [Abstract] [Full Text] [PDF]