Below is a chart that shows the results of a series of inter se complementation

Question

Below is a chart that shows the results of a series of inter se complementation tests for 6 independently isolated mutations that affect the sense of touch in a model organism, the nematode worm C. elegans. The research team screened a mutagenized population for individual worms that were unable to respond to a "tickle" with a fine hair, indicating that some process in the sensing of mechanical stimuli had gone awry in the insensitive mutants. In crosses of the different mutations, the offspring exhibited either normal, wild-type responses (+) or insensitivity (x) to touch. How many different genes are identified by mutations obtained in the genetic screen of this study? Explain your reasoning in 500 words or less.

Explanation / Answer

Complimentation test is used to determine whether two mutations associated with the specific phenotype represent two different forms of the same gene or are variations of two different genes.

So, there are three possible genes based on the results of complimentation test. They are,

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