Physical structures involved in chromosome transfer

Content
Sexuality and Recombination in Bacteria and Viruses
Three Methods for Transfer of Genetic Material 
Sexual conjugation in bacteria 
Culture media and mutant strains
Discovery of gene transfer
Discovery of linkage in bacteria
Donor and recipient strains
- Mechanism of chromosome transfer
- Physical structures involved in chromosome transfer
Linkage maps in bacteria
Conjugation mapping through interrupted mapping
Circular linkage map
Linkage information from transformation
Recombination after gene transfer
High resolution mapping
Linear order of genes
Replication and recombination in viruses 
Replication of bacteriophages
Lysogenic bacteria
Transduction
Recombination in viruses
Circular genetic maps in viruses

Physical structures involved in chromosome transfer
The above transfer of chromosome is achieved through the conjugation tubes or F pili (singular pilus) protruding from cell walls of F+ or Hfr cells. These pili are absent in F- cells, and come in contact with these F- cells to provide the passage for transfer. The pili have actually been observed under electron microscope.