Bilateral Gynandromorphism in Feathers


IN recent publications Lillie and Juhn1, Domm, Gustavson, and Juhn2, and Lillie3, have suggested an explanation of the bilateral gynandromorphism of certain individual feathers. This explanation is based upon the idea that susceptibility to female hormone depends upon growth rate, being greatest for slow-growing and least for quick-growing feather tissue. These authors further describe the formation of the rachis by concrescence. The rachis thus has a double origin, and its two sides were once the two halves of the collar. This description differs widely from the accounts of Strong4,5 and of Davies6.

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  1. 1

    Physiol. Zool, 5, No. 1; 1932.

  2. 2

    Section on plumage tests in birds in "Sex and Internal Secretions". Edited by Alien ( Williams and Wilkins, 1932).

  3. 3

    Science, 74, 387; 1931.

  4. 4

    Bull. Mus. Comp. Zool Harvard, 40, 147; 1902.

  5. 5

    Biol. Bull., 3, 289; 1902.

  6. 6

    Morphologische Jahrbuche, 15, 560; 1899.

  7. 7

    Proc. Roy. Soc., B, 788, 286; 1934.

  8. 8

    J. Genetics, 3, 205; 1913.

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