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? 

1. A) Strains A and B carry mutations in the same gene.     
2. B) Strains B and D both carry the same mutation.
3. C) Strains B, C, and D carry mutations in the same gene.
4. D) Strain A carries a mutation in a different gene than strains B, C, and D.
5. E) Strains B and C both carry the same mutation.
6. F) A, B, C, and D carry mutations in the same gene.