The difference of the crossing over situation between 5:3 type aberrant asci and6:2 type aberrant asci was analyzed, and 6:2 asci were considered not to have transreplication-related crossing over frequently. The presence or absence of interferenceby the presence of transreplication-related crossing over was also analyzed, and it wasconsidered that the sp-mat interval may have been affected with interference is 5:3asci but may not have been affected in 6:2 asci. Somatic recombination was foundin one cross from the same of which large number of aberrant asci have been obtained.From above observations an explanation for the occurrence of 6:2 type aberrantasci was proposed. Main point of this explanation is that 6:2 type asci occurby a miscopying of new DNA synthesized in the localized pairing region of chromosomesduring mitosis instead of meiosis.
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Y. Kitani (1962) studied this question.