High Frequency Transduction
When induced by ultra-violet light, the lysogenic gal + /gar heterozygotes had a very high transducing power. Nearly half the phage particles bad the capacity to transduce gar recipient cells into gal+. The term, high frequency transduction (HFT) was used for such lysate, in contrast to the original low frequency transduction (LFT). HFT lysates can transduce only the gal character, producing mostly unstable gal+ /gar heterozygotes, which in turn yield HFT lysate upon ultra violet Irradiation
