Chromosome structure in phage T4, II. Terminal redundancy and heterozygosis.

Abstract
Point-mutant heterozygotes increase in frequency during phage growth under conditions of limited DNA synthesis but deletion-mutant heterozygotes do not. Heterozygotes for the h2+/h4+ marker behave as deletion-mutant heterozygotes do and are recombinant with respect to neighboring markers. These observations support the terminal-redundancy model for the chromosome of phage T4.