Journal of experimental zoology . Figure 5 Lygaeus, Coenus, Podisus, Nezara.—a, Lygaeus turcicus, second spermatocyte-division; b, sister-groups, second division; c, d, spermatogonia! groups; e, the chromosomes of d arranged in pairs;/, oogonial group; g, the same in pairs; h, i, Ccenus delius, spermatogonia! and fo!!icle-ce!l groups;/, m, Nezara hi!aris, spermatogonia! and oogonia! groups respectively. 20 Edmund B. Wilson of the male. Fertilization of such an egg by a spermatozoon con-taining the small idiochromosome will produce a group identicalwith that occurring in the male; fertilization
Journal of experimental zoology . Figure 5 Lygaeus, Coenus, Podisus, Nezara.—a, Lygaeus turcicus, second spermatocyte-division; b, sister-groups, second division; c, d, spermatogonia! groups; e, the chromosomes of d arranged in pairs;/, oogonial group; g, the same in pairs; h, i, Ccenus delius, spermatogonia! and fo!!icle-ce!l groups;/, m, Nezara hi!aris, spermatogonia! and oogonia! groups respectively. 20 Edmund B. Wilson of the male. Fertilization of such an egg by a spermatozoon con-taining the small idiochromosome will produce a group identicalwith that occurring in the male; fertilization by one containingthe large idiochromosome will produce the characteristic femalegroup. This result is thoroughly consistent with that obtainedin the first type; for if the small idiochromosome be supposed todisappear in the male, the phenomena become in every respectidentical with those occurring in the first type. The large idio-chromosome is therefore undoubtedly homologous with theheterotropic chromosome, and the latter owe
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
