Ribosomal DNA inheritance and recombination in Neurospora crassa |
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Authors: | Peter J. Russell Richard C. Petersen Sheryl Wagner |
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Affiliation: | (1) Biology Department, Reed College, 97202 Portland, OR, USA |
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Abstract: | Summary The genetic segregation of ribosomal DNA (rDNA) in Neurospora crassa was analyzed by exploiting restriction fragment length polymorphisms in the nontranscribed spacer (NTS) sequences of nine laboratory wild-type strains and wild-collected strains. In an analysis of random spore progeny from seven crosses, and of ordered tetrads from two of those crosses the rDNA was shown to be inherited in a simple, stable Mendelian fashion, exhibiting an approximately 1:1 ratio of the two parental rDNA types. No meiotic recombinants were detected among the progeny, indicating that non-sister-chromatid crossing over is highly suppressed in the rDNA region. The basis for this suppression of meiotic recombination is not known. |
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Keywords: | Neurospora crassa Ribosomal DNA Meiotic segregation Recombination Crossing over Meiotic recombination |
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