You have isolated a Vibrio fischeri strain from a squid that does not produce light. You suspect it may have a non-functional copy of the luxI gene or the luxR gene. You test this using a cross-streak test with a bacterial species known to produce autoinducer (AI-1). You observed the results below:
A.V. fischeri strain alone: No light produced
.AI-1 producing strain alone: No light produced
C.V. fischeri strain + AI-1 producing strain: Light produced
D.Does this V. fischeri have a non-functional luxI or luxR gene?
