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Biol Bull 97: 331-343. (December 1949)
© 1949 Marine Biological Laboratory
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AN ABBREVIATED CONJUGATION PROCESS IN PARAMECIUM TRICHIUM

WILLIAM F. DILLER 1

1 Department of Zoology, University of Pennsylvania, and Marine Biological Laboratory, Woods Hole, Massachusetts

1. A process of "abbreviated" conjugation occurs in one race of P. trichium in which the number of micronuclear divisions is reduced to three (or possibly four) from the "standard" pattern of five or six.

2. There may be exchange of micronuclei at the conclusion of the first division. Frequently, unidirectional passage of a gametic nucleus occurs at this time so that an asymmetry results in the two conjugants, one of them having three micronuclei and the other conjugant one micronucleus.

3. The products of the first division proceed, directly, to reconstitute the new nuclear apparatus. This they do by synkaryon formation, parthenogenetic development or a combination of the two, usually dividing twice. There is no degeneration of nuclei between divisions.






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Copyright © 1949 by the Marine Biological Laboratory.