Evidence for post-cleavage fertilization among mosaics in Habrobracon juglandis.
نویسندگان
چکیده
Habrobracon females homozygous for the mutant ebony produce about 5% mosaic progeny among fertilized eggs. The present experiment demonstrates by means of a test-cross method that in the production of these mosaics only one pronucleus is involved, and that this nucleus cleaves before union of one of its daughter nuclei with the sperm nucleus.
منابع مشابه
Increased production of genetic mosaics in Habrobracon juglandis by cold shock of newly oviposited eggs.
Eggs from an ebony stock exposed to 5-5 degrees C prior to syngamy exhibited increased production of genetic mosaics in comparison with untreated eggs from the same females. No increase in mosaic production occurred for cold-shocked cleavage-stage embryos from the ebony stock or from pre-cleavage cold-shocked eggs from a wild-type stock. Heat shock of pre-syngamy eggs also failed to increase th...
متن کاملMosaicism in Habrobracon juglandis associated with the ebony locus.
MONG species of insects that have been used for genetic studies, there Aoccasionally appear adults which are composed of two or more different genomes. In Drosophila melanogaster, where most of these mosaics were of the gynandromorph type, it has been shown that elimination of an X chromosome during early cleavage was involved (MORGAN and BRIDGES 1919; PATTERSON 1931). In a few instances, ferti...
متن کاملEffects of Temperature on Fertilization in Habrobracon.
N THE parasitic wasp Habrobracon juglandis (Ashm.), when a cross of I unrelated stocks is made, males (haploid) come from unfertilized eggs and females (diploid) from fertilized eggs. When the parental stocks are closely related, not only males from unfertilized eggs but also males (diploid) from fertilized eggs appear. That such biparental males should be produced was puzzling until WHITING br...
متن کاملDifferential Response of Meiotic Stages in Habrobracon Eggs to Nitrogen Mustard.
N some respects, the mutagenic action of the mustards on Drosophila resembles I that of X-rays. Both are nonspecific in their effects (AUERBACH and ROBSON 1946), each induces an approximate five-to-one ratio of recessive lethals to visible deletions (SLYZINSKA and SLYZINSKI 1947), the same stage of spermatogenesis appears to be sensitive to both mutagens (AUERBACH 1953) and breaks are induced a...
متن کاملAn Analysis by Selection and Crossing, of Genetic Factors Involved in Defective Venation, a Variable Character of the Parasitic Wasp, HABROBRACON JUGLANDIS (Ashmead).
PAGE INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Stock 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Selection within stock 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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ورودعنوان ژورنال:
- Genetics
دوره 72 1 شماره
صفحات -
تاریخ انتشار 1972