In transduction, a virus (bacteriophage) when released from a host bacterial strain may carry with it a part of genetic material of the host strain and may transfer it to another strain, which in turn is infected by this virus. In transformation, genetic material is released from one strain and a part may be acquired from another strain, which thus gets transformed without coming in contact with the other strain. In conjugation, genetic material is transferred through a conjugation tube, when two strains come in contact. In transcription mRNAs are formed from DNA.