Studies on hybrid sterility. I. Spermatogenesis in pure and hybrid Drosophila pseudoobscura
Studies on hybrid sterility. I. Spermatogenesis in pure and hybrid Drosophila pseudoobscura
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DOI：
10.1007/bf00374056
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发表时间：
1934-01-01
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影响因子：
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通讯作者：
DOBZHANSKY, TH.
中科院分区：
文献类型：
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作者：
DOBZHANSKY, TH.
研究了A、B两个小种F1杂交的精子发生。A[雌性]与B[雄性]的杂交[雄性][雄性]有正常大小的睾丸，没有功能精子。精原细胞和第一精母细胞正常；在胚胎形成时，有些染色体不配对。二价从0到4不等（4是完整的配对），这取决于所使用种族的“强度”。第一次减数分裂的纺锤体伸长并弯曲成环状。细胞体不能分裂。第二师缺席了。形成双核精子；它们伸长并产生退化的蠕虫状精子。B[雌性]X A[雄性]杂种[雄性][雄性]的睾丸很小。在诊断时很少或没有观察到二价。第一次减数分裂通常是多极的。单价体（-二价体）随机分布于两极，在末期或随后的间期发生分裂。第二师缺席了。形成的精子含有单个或多个细胞核，染色体数量不等。这些精子退化。讨论了这些发现对有丝分裂机制和杂交不育理论的意义。摘要作者：T. Dobzhansky
Spermatogenesis in F1 hybrids between A and B races was studied. The A [female] X B [male] hybrid [male][male] have testes of normal size, without functional spermatozoa. The spermatogonia and 1st spermatocytes appear normal; at diakinesis some of the chromosomes are not paired. Bivalents vary from 0 to 4 (4 being the complete pairing), depending upon the "strength" of the races used. The spindle of the 1st meiotic division elongates enormously and bends into a ring. The cell body fails to divide. The 2nd division is absent. Binucleate spermatids are formed; they elongate and give rise to worm-like spermatozoa that degenerate. The testes of the B [female]X A [male] hybrid [male][male] are small. At diakinesis very few or no bivalents are observed. The 1st meiotic division is frequently multipolar. The univalents (-diads) are distributed at random to the poles, and undergo a splitting either at telophase or during the ensuing interphase. The 2nd division is absent. The spermatids formed contain from a single to many nuclei with a variable number of chromosomes. These spermatids degenerate. The significance of these findings for the theories of the mechanism of mitosis and of hybrid sterility is discussed. || ABSTRACT AUTHORS: T. Dobzhansky