In this article we will discuss about the genomes in chloroplast DNA and mitochondria DNA. The phenomenon of extra-nuclear inheritance based on transmission of visible phenotypes through mitochondria and chloroplasts. Studies in the 70s revealed presence of DNA in these organelles. Both mitochondria and chloroplasts are present only in cells of lower and higher eukaryotic organisms. Detailed studies established that [...]
In this article we will discuss about the mapping of rII locus in T4. The wild type T4 phage produces small plaques with rough edges on both strains B and K of E. coli. The r mutants (rapid lysis) are easily distinguished by their large, sharp-edged plaques. The wild type phage do not lyse and release progeny phage as rapidly [...]
In this article we will discuss about the role of Ti plasmids in genetic engineering of plants. Genetic engineering of plants is carried out by introducing DNA into a cell in culture that can grow into a mature plant. An efficient vector for introduction of recombinant DNA into plant cells has been developed from plant viruses. Furthermore, the Ti plasmid [...]