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| Modern Genetic Analysis Chapter 9. The Genetics of Bacteria and Phages Bacteriophage Genetics Figure 9-19. Plaque phenotypes produced by progeny of the cross h r+ × h+ r. Enough phages of each genotype are added to ensure that most bacterial cells are infected with at least one phage of each genotype. After lysis, the progeny phages are collected and added to an appropriate E. coli lawn. Four plaque phenotypes can be differentiated, representing two parental types and two recombinants. (From G. S. Stent, Molecular Biology of Bacterial Viruses. Copyright © 1963 by W. H. Freeman and Company, New York.)

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