シヨウジヨウバエの染色体I. : ヒヨウモンシヨウジヨウバエ及びオオホシシヨウジヨウバエの生殖細胞における染色体

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Chromosomes of Drosophila busckii and D. nigromaculata were observed in germ cells with the sectioned material which was fixed with modified Carother's solution and stained with Heidenhain's iron haematoxylin. Both spermatogonial and oogonial divisions of D. busckii showed six chromosomes in the diploid set: they were provided with four large V-shaped autosomes and two sex chromosomes which are two J-shaped X chromosomes in the female, while in the male they are represented by a J-shaped X-element and a rod-like Y (Figs. 1-3). The primary spermatocyte shows three chromosomes at metaphase, two of which are autosomal bivalents having no chiasmata, and the other is an X-Y bivalent (Figs. 4-7). The chromosome number of D: nigromaculata was found to be tweleve in both spermatogonia and oogonia (Figs. 11-13). The diploid set contains ten rodshaped elements together with two spheroids. Two of the rodelements are considerably small in size. Two of the larger rods represent X chromosomes in the oogonium (Fig. 13), and X and Y chromosomes in the spermatogonium (Figs. 11-12). The primary spermatocyte showed six bivalent chromosomes which consist of four large autosomal bivalents showing no chiasmata, a small autosomal bivalent and an X-Y bivalent at metaphase.
1953-12-15