Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . sb6 Barred b6 b6 Unbarred Barred Barred This case is thus exactly similar to that of Abraxasgrossulariata and A, lacticolor. The barred character,like grossulariata, is dominant, the unbarred recessive,and to explain the results it is necessary to assumethat the female is not only heterozygous for thebarred character, but also for sex, with the femalesex-factor dominant. The recessive character inthis case is linked to
Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . sb6 Barred b6 b6 Unbarred Barred Barred This case is thus exactly similar to that of Abraxasgrossulariata and A, lacticolor. The barred character,like grossulariata, is dominant, the unbarred recessive,and to explain the results it is necessary to assumethat the female is not only heterozygous for thebarred character, but also for sex, with the femalesex-factor dominant. The recessive character inthis case is linked to the female sex-chromosome,or, as Bateson described it, the dominant character isrepelled by the female sex-factor. We may make adiagram of the kind given by Morgan if we use arod of different shape for the female-producing sex- SEX-CHARACTERS IN EVOLUTION 117 chromosome, and use the black rod for the dominantcharacter:— 10 BARRED (5 Heterozygous. UNBARRED Cj 00
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1921
