You are presented with the quiz "A mutation in what of a parent can cause children to look very different from their parents?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "amutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring" and "sometimes animal offspring look very different from their parents". 

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


 

  sex cells         