[Genetic properties of phage lambda recombinant molecules. The effect of an inserted fragment on the hybrid yield and recombination with respect to the h- and vir-markers].

The yield of mature phages in lambda gt-lambda Dm34, lambda gt-lambda DM225 and lambda gt-lambda Dm234 is 2, 8 and 8 times lower (respectively) as compared to the wild type. The output of hvir-recombinants in lambda gt-lambda Dm225 is more than an order lower as compared to the other phages. As distinct from two other hybrids, the decrease in lambda gt-lamba DM225 yield cannot be explained by red-genotype and a shortening of the phage genome as well as the decrease in the output hvir-recombinants cannot be attributed to a decrease in the yield of mature particles and to a shortening of the distance between markers. The data obtained show a contribution of Drosophila DNA to the observed effects.