Abstract
SUMMARYVarious forms of ploidy were noted in the bone marrow cells of the Chinese hamster and opossum and in the peripheral blood cultures of the opossum. The cell types in these groups of mammals ranged from hypo-haploidy to octoploidy. The diploids were in the majority. Among the heteroploid cell population the hypo-diploids were predominant. Of the several hundred hamster marrow cells, only one was scored with exact haploid complement. Other cells, that had undergone somatic reduction in these two groups of animals, did not show a specific pattern for chromosome elimination.Several cytogenetic mechanisms have been discussed in order to explain the phenomenon of somatic chromosome reduction in mammals. There is circumstantial evidence to suggest that certain proliferating nuclei adopt such cytogenetic means for self elimination.
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