"SELFING" AND OTHER FORMS OF ABERRANT RECOMBINATION IN ISOLEUCINE-VALINE MUTANTS OF NEUROSPORA

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Abstract
Preliminary study has been made of the occurrence of prototrophs at high frequency in crosses involving 2 identical or closely linked isoleucine-valine (iv) alleles. The results could not be ascribed to the action of suppressors external to the iv region. The frequency of iv prototrophs was shown to be positively correlated with the frequency of exchange between outside markers. Ordered tetrad analysis, mainly on interallele crosses, indicated that the unexpected prototrophs in such crosses are the product of a purely reciprocal recombinational event. This finding has led the authors to favor interpretations based on unequal crossing over, at least with respect to anomalous results in interallele crosses. The capacity of a strain to engage in "selfing" behavior appears to be genetically determined.