Transduction is a type of recombination that involves the exchange of bacterial DNA through bacteriophages. Bacteriophages are viruses that infect bacteria. There are two types of transduction: generalized and specialized transduction.
Once a bacteriophage attaches to a bacterium, it inserts its genome into the bacterium. The viral genome, enzymes, and viral components are then replicated and assembled within the host bacterium. Once formed, the new bacteriophages lyse or split open the bacterium, releasing the replicated viruses. During the assembling process, however, some of the host's bacterial DNA may become encased in the viral capsid instead of the viral genome. When this bacteriophage infects another bacterium, it injects the DNA fragment from the previously infected bacterium.
This type of transduction is called generalized transduction. In specialized transduction, fragments of the host bacterium's DNA become incorporated into the viral genomes of the new bacteriophages. The DNA fragments can then be transferred to any new bacteria that these bacteriophages infect. Actively scan device characteristics for identification.
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Bacterial Cell Structure. Binary Fission. What is the process called by which one strain of bacteria is apparently changed into another strain?
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Get the Answers App. Binary fission. Reproduction through conidia. Reproduction through cyst formation. Reproduction through endospore formation. However, in asexual reproduction, genetic recombination is not observed and that is why sexual reproduction has high significance in the continuation of a bacterial species. This is because, in sexual reproduction, genetic material is exchanged between two cells and which facilitates genetic recombination and creates a genetic drift in the species of a bacteria.
There are 3 ways bacteria reproduce sexually, these are:. As we have already discussed, bacteria reproduce through both asexual and sexual means. IN this section we will learn about these different modes of reproduction in bacteria. Binary Fission: In binary fission, a single bacterial cell divides into two daughter cells.
At first, the bacterial cell reaches critical mass in its form and cell components. The circular double-stranded DNA of the bacteria undergoes replication and new complementary strands are formed. These two strands of DNA are then moved to the different poles of the cell and a transverse septum then takes place and develops in the middle region of the cell which separates the two new daughter cells and thus binary fission I completed.
It is a rapid process and takes minutes to complete. Image will be uploaded soon. Conidia Formation: The formation of conidia takes place in filamentous bacteria such as Streptomyces through the formation of a transverse septum at the apex of the filament.
The part bearing the conidia is called the conidiophore and after it is detached from the mother cell, in a suitable substratum it germinates giving rise to new mycelium.
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