A TEST OF A COUNTING MODEL FOR CHIASMA INTERFERENCE

According to the model of FOSS, LANDE, STAHL and STEINBERG, chiasma in terference is a reflection of the requirement for crossovers to be sep arated by an organism-specific number of potential conversion events w ithout associated crossovers. This model predicts that tetrads with cl ose double crossovers should be enriched for conversion events that th emselves are not associated with crossing over. We tested this predict ion in Saccharomyces cerevisiae and found it to be unfulfilled.