In a Partially Diploid F′ Exconjugant, There Are Two Alleles

Multiple Choice

In a partially diploid F′ exconjugant, there are two alleles for lac (1 and 2) and two alleles for his (3 and 4) . The phenotype of this cell is identical to a lac 1 his 4 cell. What is the best interpretation?

A) Lac 1 and 2 and his 3 and 4 share only lac 1 and his 4 phenotypes.
B) Lac 1 complements lac 2 and his 3 complements his 4.
C) Lac 1 and his 4 are dominant.
D) Lac 1 and his 4 are wild types.
E) Lac 1 shows its phenotype only if his 4 is also present.