You are presented with the quiz "What does changes in the structure of the Y chromosome do?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mutations may change the structure of a chromosome or just change a single nucleotide" and "mutations in genes on the Y chromosome have been implicated in male genetic infertility". 

So, what's the best answer to the question?


 

  Male infertility         