Sex Chromosomes and Sex-Linked Genes

I Evolution of Vertebrate Sex Chromosomes and Genomes.- 1 Evidence Indicating that the X and the Y or the Z and the W were Originally an Homologous Pair of Ordinary Chromosomes.- 2 Differentiation of the Primitive Sex Elements at the Expense of the Y or W, and the Conservation of the Original X or Z.- 3 Polyphyletic Evolution of Vertebrates.- 4 Conservation of the Original X and Homology of the X-linked Genes in Placental Mammals.- 5 Conservation of the Original Z-Chromosome by Diverse Avian Species and Homology of the Z-linked Genes.- II Evolution of Dosage Compensation Mechanism for Sex-linked Genes.- 6 The Basic Difference in Constitution between the Mammalian X and the Drosophila X.- 7 The Two Different Means of Achieving Dosage Compensation for X-linked Genes Employed by Drosophila and Mammals.- 8 Various Consequences of the Dosage Compensation by X-inactivation.- 9 The Conservation of the Original X and Dosage Compensation in the Face of X-polysomy.- 10 Three Different Consequences of X-autosome Translocation.- 11 The Consequences of Y-autosome Translocation and the XO as the Normal Female of Certain Mammalian Species.- 12 Apparent Absence of Dosage Compensation for Z-linked Genes of Avian Species.- III On So-called Sex Determining Factors and the Act of Sex Determination.- 13 Elucidation of So-called Sex-determining Factors.- 14 Time and Place of Action of Sex-determining Factors in Ontogeny.- Author Index.