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[Polyploidy and deviations in the gonadal morphology of tetraploid toads, Bufo danatensis (Amphibia: Anura: Bufonidae)].

Morphological features of gonads of diploid Bufo viridis and tetraploid B. danatensis from 15 localities of USSR (453 spec.) were investigated. Females with the rudimentary ovaries were found among polyploid toads from south Turkmenia. The toads from Tajikistan having the external features of males usually demonstrated a specific kind of lateral gynandromorphism: a single side testes and rudimentary ovaries (with the normal ovarioles). The observed facts are treated either as a result of hybridization of recent species or as a result of originality of genomes organization.

Animals↗
PubMed1992

[Polyploidy and polyteny in the trophoblast cells of the mink].

According to cytophotometry, trophoblast cells in the mink placenta are both diploid and polyploid, the ploidy level ranging from 2c to 64c. A great number of mink trophoblast cells were seen to divide mitotically. In addition to the ordinary mitotic figures, polyploid mitoses as well as abnormal mitotic figures were observed. Non-classic polytene chromosomes, peculiar to the mammalian trophoblast, appeared in the mink trophoblast cells to have the highest ploidy. A relatively low ploidy degree is due, probably, to a lesser invasive activity of the mink trophoblast cells as compared to the rodent giant trophoblast cells.

Animals↗