CYTOLOGY OF PAEDOGENESIS IN GALL MIDGE MYCOPHILA-SPEYERI
CYTOLOGY OF PAEDOGENESIS IN GALL MIDGE MYCOPHILA-SPEYERI
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DOI：
10.1007/bf02451446
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发表时间：
1971-01-01
期刊：
影响因子：
1.6
通讯作者：
CAMENZIND, R
中科院分区：
文献类型：
--
作者：
CAMENZIND, R
在瘿蚊Mycophila speyeri 的生殖发育雌性卵中，仅发生一次等式减数分裂。初级卵裂核含有29条染色体。在第四次卵裂中，23条染色体从未来的体细胞核中被消除，而原始种系核保留了较高的染色体数量。雄性卵子的生殖发育始于两次减数分裂。具有 14 或 15 条染色体的卵核与两个（有时只有一个）母体起源的体细胞核 (2n=6) 融合（调节）。因此，初级卵裂核含有26或27条染色体，有时只有20或21条。在卵裂分裂V和VI中的消除导致体细胞核具有3条染色体，而原始种系核保持较高的染色体数目。——讨论了雄性和雌性卵之间的差异以及瘿蠓的调节进化。
In paedogenetically developing female eggs of the gall midgeMycophila speyerionly one equational meiotic division occurs. The primary cleavage nucleus contains 29 chromosomes. In the fourth cleavage division 23 chromosomes are eliminated from the future somatic nuclei while the primordial germ-line nucleus keeps the high chromosome number.—The paedogenetic development of male eggs begins with two meiotic divisions. The egg nucleus with 14 or 15 chromosomes fuses with two, sometimes only one, somatic nuclei (2n=6) of maternal origin (regulation). Thus the primary cleavage nucleus contains 26 or 27 chromosomes, sometimes only 20 or 21. Elimination in cleavage divisions V and VI leeds to somatic nuclei with 3 chromosomes while the primordial germ-line nucleus keeps the high chromosome number.—Differences between male and female eggs and the evolution of regulation in gall midges are discussed.