. Bulletin of the British Ornithologists' Club. Vol. xlviii.] 102 the fact which I have already mentioned, that the male in birds has the constitution 2 X and the female 1 X, is con- clusively established by breeding experiments, which I cannot go into now. Of course, if the aberration in chromosome distribution occurred at a later division than the first you would not get a half-and-half gynandromorph, but one in which the greater part of the body was male and a smaller part female. Grynandromorphs of that kind actually occur in insects, but. Fig. 1.—Diagram illustrating the explanation of th
. Bulletin of the British Ornithologists' Club. Vol. xlviii.] 102 the fact which I have already mentioned, that the male in birds has the constitution 2 X and the female 1 X, is con- clusively established by breeding experiments, which I cannot go into now. Of course, if the aberration in chromosome distribution occurred at a later division than the first you would not get a half-and-half gynandromorph, but one in which the greater part of the body was male and a smaller part female. Grynandromorphs of that kind actually occur in insects, but. Fig. 1.—Diagram illustrating the explanation of the origin of a Gynan- dromorph by the elimination of one of the products of division of one of the X-chromosomes. The other chromosomes are not shown. the few which have been described in birds seem to be all of the bilateral type. There are only three or four which generally figure in zoological literature, a Chaffinch de- scribed by Weber in 1890, a Bullfinch by Foil in 1909, and a Pheasant by Bond in 1913, while in 1923 Macklin described a rather different type of gynandromorph in the fowl which I shall refer to again presently. The exist- ence or former existence of several other gynandromorph birds is known, but they have not been adequately described. Professor Poll, of Hamburg, whom T met quite unexpectedly. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Taylor, Nancy M. Oxford : Clarendon Press
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