Weaver et al. (1981) have demonstrated that yeast has a conversion mechanism that can fill a double-strand gap. Szostak et al. (1983) have used this finding as the basis for a model of recombination. On the basis of genetic data, I suggest hat the gap-filling mechanism has an important role in meiotic conversion but that its role is rather different from that postulated by Szostak et al. (1983). I define conversion as the change of a length of one chromatid to the genotype of its homolog. It was sug-gested by Holliday (1962, 1964) and Whitehouse (1963) that this occurred by excision repair of mismatches in a heteroduplex intermediate in the recombination pro-cess. This correction mechanism is shown in Figure la. It is supposed that an enzyme system recognizes the
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P. J. Hastings (1984) studied this question.