Chromosomes and isozymes of hypotriploid strains of the rotifer Brachionus plicatilis
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Some S type strains of the rotifer Brachionus plicatilis were found to have particular band patterns of certain enzymes, which suggested that the strains were triploids or trisomics for some chromosomes. Chromosomes of the strains were then observed by a conventional squash method of preparation. Analysis of chromosomes was made in comparison with the karyotype of amictic female S type rotifer. The strains were found to be hypotriploids. A strain which was derived from one of the hypotriploid strains was also studied, and was found to be diploid. The relationship between the chromosomes, the isozyme patterns, the origin of the hypotriploid strain and the derived diploid strain were discussed.
Key wordskaryotype isozyme pattern hypotriploid
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