The genes shown are from the lac operon system of E.coli. The symbols a, b and c represent the repressor (I) gene, the operator (O) region, and the structural gene (Z) for B- galactosidase, although not in that order. Furthermore, the symbols written in the genotypes are note necessarily the actual sequence in the lac operon. Genotype Activity(+) or Inactivity (-) of Z Gene Inducer Absent Inducer Present abtct at btc at bc a* b c*/a b* c at b* c*/ a bc at b*c/ a b ct ab'c/ at b c Which symbol (a, b or c) represents each of the lac genes, I, O, and Z. a is lac O: b is lac I; c is lac Z O a is lac O: c is lac I: b is lacZ O a is lac Z: b is lac I; c is lac O O a is lac I: b is lac O: c is lac Z
Bacterial Genomics
The study of the morphological, physiological, and evolutionary aspects of the bacterial genome is referred to as bacterial genomics. This subdisciplinary field aids in understanding how genes are assembled into genomes. Further, bacterial or microbial genomics has helped researchers in understanding the pathogenicity of bacteria and other microbes.
Transformation Experiment in Bacteria
In the discovery of genetic material, the experiment conducted by Frederick Griffith on Streptococcus pneumonia proved to be a stepping stone.
Plasmids and Vectors
The DNA molecule that exists in a circular shape and is smaller in size which is capable of its replication is called Plasmids. In other words, it is called extra-chromosomal plasmid DNA. Vectors are the molecule which is capable of carrying genetic material which can be transferred into another cell and further carry out replication and expression. Plasmids can act as vectors.
35. The genes shown are from the lac operon system of E.coli. The symbols a, b and c represent the repressor (I) gene, the operator (O) region, and the structural gene (Z) for β-galactosidase, although not in that order. Furthermore, the symbols written in the genotypes are not necessarily the actual sequence in the lac operon.
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