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RESEARCH PRODUCT
The chromosomes of 16 molluscan species
Maria B. RasottoRoberto VitturiNunzia Farinella-ferruzzasubject
Chromosome 17 (human)B chromosomeChromosome 4Chromosome 16Chromosome 3Chromosome 18ZoologyAnimal Science and ZoologyBiologySmall supernumerary marker chromosomeChromosome 12description
Abstract Chromosome numbers were determined for two species of Placophora, eleven species of Gastropoda, one species of Pelecypoda and two species of Cephalopoda. No heterotypic or supernumerary chromosome resulted from the analysis of meiotic and, when possible, of mitotic chromosomes. For this reason no positive evidence emerges for the presence of differentiated sex chromosome pairs. Data available seem to indicate that evolution within the Mollusca phylum has been accompanied by a decrease in both chromosome number and DNA content (according to Hinegardner, 1974), if we consider subclasses, orders and families (apart from the subclass Prosobranchia). On the contrary the primitive class Placophora possesses a lower number of chromosomes than the Cephalopoda, which is the most specialized class.
year | journal | country | edition | language |
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1982-01-01 | Bolletino di zoologia |