A series of phage T1 DNA clones containing 3A fragments of 1 kb or more were tested for their ability to rescue the defects of amber mutations representing all known T1 genes. Rescue was detected by either complementation or recombination. These data have extended the correlation of the T1 genetic and physical maps and provided more conclusive proof that the large map distances at the left end of the genetic map reflect both increased physical separation of the known genetic markers and enhanced recombination and that the right and left chromosomal ends are recombinogenic to the same extent.

Keyword(s): complementation , DNA clones and phage T1

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