Question

In an Hfr mating with an F- cell, why does the recipient cell NOT always become an Hfr or F+ cell?

Options:
a) Lack of conjugation pilus
b) Integration of the F factor into the chromosome
c) Unidirectional transfer of genetic material
d) Exclusion of the F factor by the recipient cell

Answer 1

The recipient cell does not always become an Hfr or F+ cell due to factors like the lack of conjugation pilus and the exclusion of the F factor by the recipient cell. The integration of the F factor into the chromosome and the unidirectional transfer of genetic material also contribute to the variation in outcomes during conjugation.

Step-by-step explanation:

During conjugation between an Hfr cell and an F- cell, the recipient cell does not always become an Hfr or F+ cell because of a combination of factors. First, the recipient cell may lack the conjugation pilus, which is necessary for the transfer of genetic material. Second, the integration of the F factor into the chromosome may not occur in every mating event. Third, the transfer of genetic material is often unidirectional, meaning that only certain genes closest to the integration site are transferred. Finally, the recipient cell may exclude the F factor, preventing it from becoming an Hfr or F+ cell.