LBA technique in the detection of chromosome variants

Summary In Part I of this communication, a technique (LBA) was described which used DNA replication in the evaluation of chromosome variants in man. It was shown that the method was very useful in the detection of variants in D-and G-group chromosomes. Results on pairs 3 and 4 were also presented.In Part II, the rest of chromosomes were examined. In the evaluation of qh variants in 1,9 and 16, the LBA technique proved itself to be a very effective implement. It was practically free of technical variables coherent with C-band technique and, therefore, it was possible to use the size of an euchromatic segment of a chromosome as a reference standard. LBA variants were observed in about 50% of the members of the remaining 12 pairs of chromosomes, i.e., 2, 5, 6, 7, 8, 10, 11, 12, 17, 18, 19, and 20.