6533b85dfe1ef96bd12bdd2c

RESEARCH PRODUCT

The chromosomes of 16 molluscan species

Maria B. RasottoRoberto VitturiNunzia Farinella-ferruzza

subject

Chromosome 17 (human)B chromosomeChromosome 4Chromosome 16Chromosome 3Chromosome 18ZoologyAnimal Science and ZoologyBiologySmall supernumerary marker chromosomeChromosome 12

description

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.

https://doi.org/10.1080/11250008209439373