Which conclusions are consistent with these data? Why? A) Strains A and B carry mutations in the same gene. B) Strains B and D both carry the same mutation. C) Strains B, C, and D carry mutations in the same gene. D) Strain A carries a mutation in a different gene than strains B, C, and D. E) Strains B and C both carry the same mutation. F) A, B, C, and D carry mutations in the same gene.
A researcher is studying the rII locus of phage T4. FourrII− strains are obtained: A, B, C, and D. In the first experiment, E. coli strain K(λ) is coinfected with two rII− strains simultaneously and the results are recorded.
Infection with A and B phage = lysis occurs
Infection with A and C phage = lysis occurs
Infection with B and C phage = no lysis occurs
Infection with B and D phage = no lysis occurs
Infection with C and D phage = no lysis occurs
In a second experiment, coinfections are performed first in E. coli strain B, then the progeny phage are used to infect E. coli strain K(λ).
Progeny of A and B phage = plaques form
Progeny of B and C phage = plaques form
Progeny of C and D phage = plaques form
Progeny of B and D phage = no plaques from
Which conclusions are consistent with these data? Why?
- A) Strains A and B carry mutations in the same gene.
- B) Strains B and D both carry the same mutation.
- C) Strains B, C, and D carry mutations in the same gene.
- D) Strain A carries a mutation in a different gene than strains B, C, and D.
- E) Strains B and C both carry the same mutation.
- F) A, B, C, and D carry mutations in the same gene.
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