Abstract
Mature unfertilized eggs (oocytes) dissected from the ovary of the sawfly Athalia rosae (Hymenoptera) begin parthenogenetic development if exposed to distilled water and produce haploid males. Injection of sperm into mature oocytes through the anterior pole resulted in karyogamy in a fraction of cases which developed as diploid females. No haploid-haploid chimeras due to independent participation of the injected sperm in development were produced. When sperm were injected through the posterior pole, however, fertilization never occurred but haploid-haploid chimeras were produced in a smaller fraction of cases. Both egg nucleus-derived and injected sperm-derived nuclei contributed in forming the germ cells of the chimeric males.
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