title: The role of Haldane's rule in sex allocation.
abstract: Sex allocation theory predicts that parents should bias their reproductive investments toward the offspring sex generating the greatest fitness return. When females are the heterogametic sex (e.g., ZW in butterflies, some lizards, and birds), production of daughters is associated with an increased risk of offspring inviability due to the expression of paternal, detrimental recessives on the Z chromosome. Thus, daughters should primarily be produced when mating with partners of high genetic quality. When female sand lizards (Lacerta agilis) mate with genetically superior males, exhibiting high MHC Class I polymorphism, offspring sex ratios are biased towards daughters, possibly due to recruitment of more Z-carrying oocytes when females have assessed the genetic quality of their partners. If our study has general applicability across taxa, it predicts taxon-specific sex allocation effects depending on which sex is the heterogametic one.
authors.affiliation: Department of Zoology, The University of Gothenburg, Animal Ecology, 413 90 Gothenburg, Sweden. molsson@uow.edu.au
authors.forename: Mats
authors.initials: M
authors.lastname: Olsson
authors.forename: Thomas
authors.initials: T
authors.lastname: Madsen
authors.forename: Tobias
authors.initials: T
authors.lastname: Uller
authors.forename: Erik
authors.initials: E
authors.lastname: Wapstra
authors.forename: Beata
authors.initials: B
authors.lastname: Ujvari
mesh_terms: D000818:Animals; D005260:Female; D005805:Genes, MHC Class I; D006579:Heterozygote; D008116:Lizards / Q000002:abnormalities / Q000235:genetics / Q000502:physiology*; D008297:Male; D018895:Microsatellite Repeats; D011110:Polymorphism, Genetic; D012098:Reproduction / Q000235:genetics*; D012641:Selection, Genetic; D012744:Sex Ratio; D013548:Sweden