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Received August 14, 1963 G E N E T I C recombination between nuclei in vegetative mycelia has been demonstrated in numerous species of fungi. The mechanism of somatic recombi1961, nation in the Basidiomycetes (ELLINGBOE RAPER1962a; ELLINGBOE and 1963) appears to be quite distinct from the Parasexual Cycle described in the Ascomycetes (PONTECORVOKAFER1961). Haploidization in the Parasexual 1956; Cycle proceeds via stages of aneuploidy and would, therefore, recombine only genes on different chromosomes, barring the occurrence of infrequent somatic 1961). crossovers (EFER Analysis of somatic recombination in Schizophyllum commune has indicated two mechanisms of genetic exchange in vegetative cells. In one mechanism, following the formation of a diploid nucleus, reduction of the diploid nucleus proceeds via a process that is indistinguishable from meiosis. Recombination frequencies of linked and nonlinked genes were similar to those obtained via the standard sexual cycle. Furthermore, there is no evidence that haploidization and crossing over are separated in time and space as in the Parasexual Cycle (PONTECORVO 1956). A second mechanism of recombination in vegetative cells of S. commune was described in which only the incompatibility factor specificities were transferred from two nuclei into a third nucleus (ELLINGBOE 1963; ELLINGBOE RAPER and 1962a). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genetics Genetics Society of America

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