Question
Question: When HFR conjugates with an \(F^-\) bacterium. the A \(F^-\) cell will convert to \(F^+\) but alw...
When HFR conjugates with an F− bacterium. the
A F− cell will convert to F+ but always a recombinant
B F− cell will convert to F+ but always a not recombinant
C F− Hill remain F+ and may or may not be a recombinant
D F− will convert to Hfr without recombination
Solution
High frequency recombination (Hfr) bacteria are those that have their F− plasmid (sex factor) integrated with their chromosomal DNA. The frequency of recombination is quite high in the cross (conjugation) between Hfr cells and F− cells, but the frequency of transfer of the entire F− factor is relatively low.
Complete answer:
High-frequency recombination cells are abbreviated as HFR. HFR cells are those in which the plasmid has been incorporated into the chromosomal DNA. As a result, when bacteria conjugate with F− cells using F− plasmid genes, the genes that are closer to the F cells are also transferred to the F− cells.
This would result in the F cells forming a partly diploid state, as they may have two sets of some genes. As a result, recombination between homologous genes may be possible in these cells. As a result, the right response is 'F− cell will convert to F+, but it will always be a recombinant'.
So option A is the correct answer.
Note:
Bacterial conjugation is the transfer of genetic material between bacterial cells by direct cell-to-cell contact or a bridge-like link. This is accomplished through the use of a pilus. In bacteria, it is a parasexual way of reproduction. It, like transformation and transduction, is a horizontal gene transfer method, however these two do not involve cell-to-cell contact.