Let's have some fun here, shall we?
A. If there is a gay gene as gay activists have sworn there is, then the professor is right. Why then would gay activists dimiss the professor's assertions as "pathetic"?
B. If the professor is wrong and there is no chance in a devil's hell of a "gay gene" being passed on to a child then the gay gene theory is officially an urban myth.
C. If the professor and activists are both right, then we are all in BIG trouble. With a homosexual gene being passed, I predict less than 50 years before the end of the world.