No abstract

discussed whether homologue affinity lies in the kinetochore or telomere; these two photographs suggest that either one could contain the necessary specificity for pairing.Thousands of chromosome preparations have been observed, but only one example of somatic pairing (Fig. 1) and four examples of the qua.drive.lent configuration (Fig. 2) have been seen. It is unfortunate that these particular chromosome spreads were not labelled, for autoradiographic patt,erns might tell something about the time during the lifo cycle of a cell when somatic crossingover and sister chromatid exchange occur.