7. The F-factor is a group of genes that encode all the proteins necessary for a

Question

7. The F-factor is a group of genes that encode all the proteins necessary for a bacterial cell to make a sex pilus. The F-factor can either be in the genome (within the chromosome) of cell, or residing on extrachromosomal DNA (plasmid). Cells without the F factor are given the label “F-“. The genetic material transferred from donor cells with the F factor is different depending on where the donor cell has the F factor encoded. Complete the table below, providing the names given to cells with the F factor, and the type of genetic material usually transferred by that donor (other than small plasmids that can always be exchanged by chance).

Cell status: Label given: Genetic material transferred: No F factor F- Not a donor in these circumstances F factor on plasmid _______ ______________________________ F factor in chromosome _______ ______________________________

Explanation / Answer

Ans: F factor is responsible for transfer of genetic material from the Donor carrying the F factor to the reciepient lacking it.

In case of F factor on plasmid, it is referred to as F + bacteria. Only plasmid will be transferred

In case of F factor on chromosome, it is referred to as Hfr bacteria. In this case the chromosomal part bearing the f factor will be transfered or the entire genome depending on time of conjugation.

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