If one Hfr strain transfers genes A, B and then C and another Hfr strain transfers genes
B, C and G, then one can say that:
A) These Hfr strains have different rates of transcription.
B) One strain transfers plasmid DNA and the other strain does not.
C) One strain is capable of conjugation and the other strain does not.
D) The size of the chromosome is different for the two strains.
E) none of the answers are correct
If one Hfr strain transfers genes A, B and then C and another Hfr strain transfers genes
B, C and G, then one can say that:
A) These Hfr strains have different rates of transcription.
B) One strain transfers plasmid DNA and the other strain does not.
C) One strain is capable of conjugation and the other strain does not.
D) The size of the chromosome is different for the two strains.
E) none of the answers are correct
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Part B
A synthetic lethal interaction is one in which two yeast stains with non-lethal phenotypes are crossed and the resulting double mutant is lethal.
Of these yeast strains, what are all the possible combinations that could be crossed to look for synthetic lethal interactions?
Strain A: a null mutation in a nonessential gene
Strain B: a null mutation in an essential gene
Strain C: a conditional mutation in an essential gene
(B) Yeast cells with a null mutation in an essential gene cannot survive.
(C) However, if the mutation in the essential gene is conditional (meaning that the phenotype only shows under certain conditions), the cell can survive under normal conditions.
(A) Additionally, cells with null mutations in nonessential genes can survive because the nonessential genes are not required for survival.
Select all that apply.
| A. strain A x strain A |
| B. strain B x strain B |
| C. strain C x strain C |
| D. strain A x strain B |
| E. strain A x strain C |
| F. strain B x strain C |
