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In bacteria, conjugation between one F + and one F - cells results in
- a)two F + cells
- b)two F - cells
- c)one F + cell and one F - cell
- d)one Hfr cell and one F + cell
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
In bacteria, conjugation between one F + and one F - cells results ina...
Bacterial conjugation is the unidirectional transfer of genetic material from a donor cell to a recipient by cell to cell contact or through conjugation tube. The process is first described by Lederberg, Hayes and Woolman in E.coli. The bacterium with F plasmid is the donor, F+ve or male.
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In bacteria, conjugation between one F + and one F - cells results ina...
Explanation:
In bacteria, conjugation is a process of genetic transfer that occurs between two cells through direct cell-to-cell contact. It involves the transfer of genetic material, such as plasmids, from a donor cell to a recipient cell. The donor cell is typically referred to as the F+ (F positive) cell, while the recipient cell is referred to as the F- (F negative) cell.
Conjugation between one F+ and one F- cell:
When a conjugation event occurs between one F+ cell and one F- cell, the following process takes place:
1. Formation of a conjugation bridge: The F+ cell extends a thin, proteinaceous appendage called the sex pilus towards the F- cell. The sex pilus establishes a physical connection between the two cells, forming a conjugation bridge.
2. Transfer of genetic material: The F+ cell contains a fertility factor (F factor) in the form of a plasmid, which carries the genes required for conjugation. The F factor is transferred from the F+ cell to the F- cell through the conjugation bridge. This results in the F- cell acquiring the F factor and becoming an F+ cell.
3. Replication of the F factor: Once the F factor is transferred to the F- cell, it circularizes and replicates. This replication process ensures that both the donor and recipient cells possess a complete copy of the F factor.
4. Formation of two F+ cells: As a result of conjugation, both the original F+ cell and the recipient F- cell now possess a complete copy of the F factor. Therefore, the conjugation between one F+ and one F- cell results in the formation of two F+ cells.
Thus, the correct answer is option 'A': two F+ cells.
In bacteria, conjugation is a process of genetic transfer that occurs between two cells through direct cell-to-cell contact. It involves the transfer of genetic material, such as plasmids, from a donor cell to a recipient cell. The donor cell is typically referred to as the F+ (F positive) cell, while the recipient cell is referred to as the F- (F negative) cell.
Conjugation between one F+ and one F- cell:
When a conjugation event occurs between one F+ cell and one F- cell, the following process takes place:
1. Formation of a conjugation bridge: The F+ cell extends a thin, proteinaceous appendage called the sex pilus towards the F- cell. The sex pilus establishes a physical connection between the two cells, forming a conjugation bridge.
2. Transfer of genetic material: The F+ cell contains a fertility factor (F factor) in the form of a plasmid, which carries the genes required for conjugation. The F factor is transferred from the F+ cell to the F- cell through the conjugation bridge. This results in the F- cell acquiring the F factor and becoming an F+ cell.
3. Replication of the F factor: Once the F factor is transferred to the F- cell, it circularizes and replicates. This replication process ensures that both the donor and recipient cells possess a complete copy of the F factor.
4. Formation of two F+ cells: As a result of conjugation, both the original F+ cell and the recipient F- cell now possess a complete copy of the F factor. Therefore, the conjugation between one F+ and one F- cell results in the formation of two F+ cells.
Thus, the correct answer is option 'A': two F+ cells.
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