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In order to survey the distribution along the bacteriophage λ chromosome of Rec-mediated recombination events, crosses are performed using conditions which block essentially all DNA synthesis. One parent is density-labeled and carries a genetic marker in the left terminal λ gene (A), while the other parent is unlabeled and carries a genetic marker in the right terminal λ gene (R). Both parents are deleted for the λ recombination genes int and red, together with other recombination-associated genes, by virtue of either (1) a pure deletion or (2) a bio insertion-deletion. The distribution in a cesium density gradient of the resulting A+R+ recombinant phage reflects the chromosomal distribution of the recombination events which gave rise to those phage.

genetics

REC-MEDIATED RECOMBINATIONAL HOT SPOT ACTIVITY IN BACTERIOPHAGE LAMBDA. I. HOT SPOT ACTIVITY ASSOCIATED WITH SPI-DELETIONS AND <i>bio</i> SUBSTITUTIONS

REC-MEDIATED RECOMBINATIONAL HOT SPOT ACTIVITY IN BACTERIOPHAGE LAMBDA. I. HOT SPOT ACTIVITY ASSOCIATED WITH SPI-DELETIONS AND bio SUBSTITUTIONS