Incipient sex chromosome differentiation in an isopod crustacean species,Asellus aquaticus |
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Authors: | A. Rocchi G. Prantera V. Lanza M. Di Castro |
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Affiliation: | (1) Dipartimento di Genetica e Biologia Molecolare, Universitá di Roma La Sapienza, 00185 Rome, Italy;(2) Centro di Genetica Evoluzionistica del C.N.R., Rome, Italy |
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Abstract: | Asellus aquaticus, a sexually dimorphic isopod crustacean, has no morphologically distinguishable sex chromosome pair. In 25% of the males from a natural population the fluorochrome chromomycin A3 revealed a pair of metacentric chromosomes that was heteromorphic for two heterochromatic areas. One chromosome had a fluorescent band in each of the two arms, whereas the other chromosome lacked both bands. Chromosomal analysis was performed on 50 sibships produced by known parents. The heterochromosome was inherited only by the male offspring of males bearing it. Its distribution led us to postulate the existence of an incipient differentiating sex chromosome pair in the A. aquaticus population.This paper is dedicated to Prof. Guiseppe Montalenti on the occasion of his 80th birthday. |
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