Abstract
When a pair produce mainly or exclusively males this phenomenon is called arrhenogeny, thelygeny in the opposite case. Amphogeny defines the paritary sex ratio of the offspring (Vandel, 1941). The embryos of two geographical populations ofAsellus aquaticus L. (Crust. Isop.) one French and one Italian and the hybrids of these two populations were bred and reared in standard conditions of temperature, nutrition and crowding at natural photoperiod. Female rate of the offspring is significantly different between French (50% ♀♀) and Italian (39% ♀♀). The majority of the FrenchAsellus families were amphogenic, very few thelygenic and arrhenogenic. In the ItalianAsellus families the arrhenogenic were very many and the thelygenic very few. In the hybrid offspring the female rate depend on the mother origin. These results led to suppose a «maternal inheritance» in sex determination: we suggest the cooperation between a cytoplasmic factor and a set of genes responsible of the sex determination. We suggest that the cytoplasmic factor (a mithocondrial DNA?) can inactivate randomly only one of the two sets of genes responsible of a sex.
Riassunto
Quando una coppia produce soprattutto o esclusivamente maschi, questo fenomeno è chiamato arrenogenia, teligenia nel caso opposto. Anfogenia definisce il rapporto sessi paritario della prole (Vandel, 19-41). Gli embrioni di due popolazioni geogratiche diAsellus aquaticus L. (Crust. Isop.) una francese e l’aitra italiana e gli ibridi di queste due popolazioni sono stati allevati in condizioni standard di temperatura, cibo ed affollamento a fotoperiodo naturale. Il tasso di femmine delle figliate e significativamente differente fra i trancesi (50% ♀♀) e gli italiani (39% ♀♀). La maggioranza delle famiglie francesi diAsellus sono anfogene, molto poche le teligene e le arrenogene. Nelle tamiglie diAsellus italiane moke sono quelle arrenogene e poche le teligene. Nella generazione ibrida il tasso di femmine dipende dalla madre. Questi risultati ci portano a supporre una «eredità materna» nella determinazione del sesso: suggeriamo che un fattore citoplasmatico (un DNA mitocondriale?) possa inattivare a caso uno dei due set di geni responsabili di un sesso.
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Nella seduta del 12 marzo 1994.
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Vitagliano, E., Marchetti, E. & Maccauro, P. Correlation among skewed sex-ratio, monogeny and maternal sex determination in Asellus aquaticus (L. ). Rend. Fis. Acc. Lincei 5, 289–297 (1994). https://doi.org/10.1007/BF03001628
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DOI: https://doi.org/10.1007/BF03001628