Four new linkage groups inCoprinus lagopus

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Abstract
1. By means of tetrad analysis three vitamin-requiring mutants have been established as markers of centromeres distinct from those of the two known chromosomes.2. Mutants existing in stock were tested for linkage with these centromere markers, and four previously unknown linkage groups with independent centromeres thereby established and accurately mapped.3. Corrections were made to the maps of existing linkage groups. TheAlocus (Group I) was shown to be approximately four times as distant from its centromere as hitherto supposed (at least in most crosses); and several markers of Group II were mapped for the first time.