12th Zoology

Viral genetics

Viral genetics

The viral genome contains all the genetic information either as DNA
or RNA. but never both. The proportion of nucleic acid in a virion varies
from 1 % as in influenza virus to about 50%, as in certain phages. Smaller
viruses like paraviruses may have 3 to 4 genes while larger viruses like
herpes and pox may have several hundred genes. Viral genetics

Virions contain only a single copy of the nucleic acid. Hence they are called haploid viruses. The only exception is the retroviruses, which are said to be diploid as they contain two identical single-stranded RNA genomes. The virions are called the infectious particles. Viral genetics

The structure of nucleic acid in the virion may be either linear or
circular. The DNA of most animal viruses in a linear molecule. In some plant
viruses the genome is a circular RNA. But the RNA in animal viruses exists
only as linear double stranded or single stranded molecule. Viral genetics

Related Topics in Zoology:

Bio Zoology All Important Topics


  1. Microbiology Introduction and History of Medical Microbiology

  2. Pasteur, Koch, Lister

  3. Structure of Viruses

  4. Viral genetics

  5. Virus Culture

  6. Viral Diseases

  7. Bacteria Structure Culture

  8. Bacterial Genetics

  9. Bacterial Diseases

  10. Protozoan microbiology

  11. Pathogenecity of Microorganisms

  12. Antimicrobial Resistance

  13. Antibiotics and Chemotherapy

  14. AIDS – HIV

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