title: Parental hormone levels and the possibility of establishing that some mammalian sex ratio variation is adaptive.
abstract: The problem of whether some mammalian sex ratio variation is adaptive is proving intractable. A fresh approach to the problem is suggested here.
authors.affiliation: MRC Mammalian Development Unit, Wolfson House, University College London, U.K.
authors.forename: W H
authors.initials: WH
authors.lastname: James
mesh_terms: D000818:Animals; D004967:Estrogens / Q000378:metabolism; D005260:Female; D006062:Gonadotropins / Q000378:metabolism; D006728:Hormones / Q000378:metabolism*; D006801:Humans; D008297:Male; D008954:Models, Biological; D012744:Sex Ratio; D013739:Testosterone / Q000378:metabolism
chemical_list: D004967:Estrogens; D006062:Gonadotropins; D006728:Hormones; D013739:Testosterone