Question

How is a merozygote formed?

A. The F factor is inserted into the chromosome of an F+ cell, causing it to revert to F−.
B. The F factor and several adjacent genes are excised from the chromosome of an F+ cell and transferred to an F− strain.
C. The F factor is excised from the chromosome of an Hfr strain, causing it to revert to F−.
D. The F factor is inserted into the chromosome of an F− cell, causing it to become an Hfr strain

Answer 1

A merozygote is formed when the F plasmid integrates into the bacterial chromosome, forming an Hfr cell, which can then transfer chromosomal DNA to an F- cell. The F plasmid may also be imprecisely excised, leading to the formation of an F' plasmid that carries chromosomal DNA adjacent to the integration site.

Step-by-step explanation:

A merozygote is formed when the F plasmid, which carries genetic information, integrates into the bacterial chromosome through recombination, creating an Hfr (High-frequency recombination) cell. This Hfr cell can transfer chromosomal DNA to an F- cell through conjugation. The F plasmid may also be imprecisely excised from the chromosome, resulting in the formation of an F' plasmid that carries chromosomal DNA adjacent to the integration site.