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For bacteria that are F+, Hfr, F', and F- answer the following. a. Describe the state of the F factor. b. Which of these cells are donors? Which is the recipient?c. Which of these donors can convert exconjugants to a donor state? d. Which of these donors can transfer a donor gene to exconjugants?e. Describe the results of conjugation (i.e., changes in the recipient and the exconjugant) that allow detection of the state of the F factor in a donor strain. f. Describe a "partial diploid" and how it originates.

Question

For bacteria that are F+, Hfr, F', and F- answer the following. 

a. Describe the state of the F factor. 

b. Which of these cells are donors? Which is the recipient?

c. Which of these donors can convert exconjugants to a donor state? 

d. Which of these donors can transfer a donor gene to exconjugants?

e. Describe the results of conjugation (i.e., changes in the recipient and the exconjugant) that allow detection of the state of the F factor in a donor strain. 

f. Describe a "partial diploid" and how it originates. 

check_circleAnswer
Step 1

 

a)

The F factor is called “Fertility factor,” which is present on the F episome. This factor discovered by the “Luigi L. Cavalli-Sforza and Esther M. Lederberg.” The F factor has several forms according to genes or factors involved in it. The state of each F factor is as follows:

  • F+- This strain has only DNA (deoxyribonucleic acid) for the Fertility factor as individually and does not contain DNA of host or bacterial genome. It is present in the cytoplasm.
  • Hfr – This type of strain has an F factor, which is completely inserted into the bacterial genome
  • F‘- – This type of strain has an F factor that has few pieces of bacterial genome attached to the F factor DNA. It is formed due to improper excision from the bacterial genome.
  • F- - This form does not contain F-factor and it chiefly acts recipients.
Step 2

b)

The bacterial strain that donate F factor is called donor, whereas a strain that receives F factor is called receiver. Usually, the strains that possess F factor categorized under donors and the strain that do not possess F factor and accepts it are categorized under receivers.

Thus, the F+, Hfr, and F’ known as donors and F- is known as recipient.

Step 3

c)

The strains F+and F’ can convert an exconjugant to a donor state. The cross between either,    F+*F-, or F’*F- can convert the exconjugant “...

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