title: B-chromosomes and male-biased sex ratio with paternal inheritance in the fairy shrimp Branchipus schaefferi (Crustacea, Anostraca).
abstract: This study reports on male-biased sex ratios in west Mediterranean populations of the freshwater anostracan Branchipus schaefferi (Crustacea, Anostraca, Branchipodidae), in contrast to populations elsewhere. Crossing experiments over several generations indicate a clear paternal inheritance of the trait, possibly with a dosage effect. Various mechanisms which may underlie this phenomenon are discussed, the most plausible being the presence of one or more supernumerary ('B') chromosomes--as evidenced by karyological observations--interfering with sex determination and probably having an accumulation mechanism in male individuals.
authors: Laboratorium voor Ecologie (WE11V), Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium. lynda.beladjal@rug.ac.be
authors: L
authors: L
authors: Beladjal
authors: T T M
authors: TT
authors: Vandekerckhove
authors: B
authors: B
authors: Muyssen
authors: J
authors: J
authors: Heyrman
authors: J
authors: J
authors: de Caesemaeker
authors: J
authors: J
authors: Mertens
mesh_terms: D000818:Animals; D002875:Chromosomes; D003433:Crosses, Genetic; D033364:Decapoda / Q000235:genetics*; D005260:Female; D008297:Male; D012727:Sex Characteristics; D012744:Sex Ratio