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Sixty-six independently produced markers have been tested for linkage with theAandBmating-type factors. Six loci linked withAand three linked withBwere found. Maps of the two linkage groups which include the centromeres were constructed. Non-identical alleles at two loci,paba-1 andchol-1, were found and crosses between different mutants were used to map the positions of the mutant sites within each locus.
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Day et al. (1961) studied this question.
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