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Transformation refers to the transfer of genetic material from one organism to another, especially in_x000D_ genetic engineering.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
Specialized transduction occurs only with temperate phages that integrate at specific attachment site forming prophage. Upon induction, excision normally precise, but rare imprecise excision deletes part of prophage and captures adjacent bacterial genes, such as lambda gal and bio near attB in E. coli. Resulting defective phage carries bacterial genes but lacks essential phage genes, requiring helper phage for propagation. Only genes flanking integration site transfer, at high frequency for those markers, not random genome. This specificity contrasts generalized transduction and explains lambda transducing phages lambda dgal and lambda dbio.
Ref: Nature Scitable, Specialized Transduction; Hartl, Chapter 6: Lysogenic Phage and Adjacent Gene Transfer
Generalized transduction results from packaging error during lytic assembly of temperate or virulent phage such as P1 or P22. Phage terminase occasionally recognizes pseudo-pac site on host chromosome and fills capsid with random host fragment of size limited by head capacity, about 100 kb for P1. Any bacterial gene can be packaged with roughly equal probability, so lysate contains mixture covering entire genome. Transducing particles infect new cells but inject only bacterial DNA, which recombines. This randomness allows mapping any gene and building linkage clusters via co-transduction analysis.
Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 6: Generalized Transduction Mechanism
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