The Journal of Experimental Zoölogy, 1906, Vol. 3 (Classic Reprint)

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Excerpt from The Journal of Experimental Zoölogy, 1906, Vol. 3 I am now able to bring forward decisive proof that the appar ently adverse evidence brought forward by Montgomery and Gross was based on errors of Observation, and that the sexes in Hemiptera of this type do in fact show a constant difference in the number of chromosomes. As far as these animals are con cerned, however, mcclung's conjecture as to the mode of fertili zation proves to have been the reverse of the truth, for it is the female, not the male, that possesses the additional chromosome, as I have determined beyond all doubt in four genera, namely, Anasa, Alydus, Harmostes and Protenor. The facts leave no doubt that both forms of spermatozoa are functional, that all of the eggs possess the same number of chromosomes, that all con tain the homologue, or maternal mate, of the accessory or hetero tropic chromosome of the male, and that fertilization by sper matozoa that possess this chromosome produces females, While males are produced upon fertilization by spermatozoa that do not possess It. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.