Question

18 multiple choice 1 point in a complementation test, two independent mutant strains showing similar phenotypes were conjugated. the zygote did not show either of the mutant phenotypes. you may likely conclude that the mutations are in the same gene the mutations are in different genes the mutations are located on the same chromosome one mutation is epistatic to the other

Explanation:

In a complementation test, if two mutant strains are conjugated and the zygote does not show the mutant phenotypes, it means the mutations complement each other. Complementation occurs when mutations are in different genes (each provides the wild - type function the other lacks). If mutations were in the same gene, they wouldn't complement (the zygote would still show the mutant phenotype). Chromosome location isn't determined by this result, and epistasis is about gene interaction in a different context (one gene masking another's effect, not complementation).

Answer:

B. The mutations are in different genes