Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . ion of bleeding) follows the samescheme, and also at least some forms of stationarynight-blindness — that is, the inability to see intwilight. We may mention a few other cases in animals,referring the reader for a fuller account to the workscited. One example is the barred character of thefeathers in the breed of fowls called Plymouth this case the female is heterozygous for sex as inAbraxas grossulariata, and the barred character issex-linked. When a barred hen is crossed with anunbarre
Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . ion of bleeding) follows the samescheme, and also at least some forms of stationarynight-blindness — that is, the inability to see intwilight. We may mention a few other cases in animals,referring the reader for a fuller account to the workscited. One example is the barred character of thefeathers in the breed of fowls called Plymouth this case the female is heterozygous for sex as inAbraxas grossulariata, and the barred character issex-linked. When a barred hen is crossed with anunbarred cock all the male offspring are barred, allthe females plain. On the other hand, if a barredcock is crossed with an unbarred hen, the barredcharacter appears in all the offspring, both males andfemales. The female thus transmits the characteronly to her sons. If we represent the barred char-acter by B, and its absence by b, we can representthe heredity as follows:— ^ Spermatogcncse humainc, Arch, de Biol., xxvii., 1912. 116 ORIGIN OF SOMATIC Barred Febiale with Unbarred MaleB6 3^ X d6 tf6. sb6 Barred b6 b6 Unbarred
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