You are presented with the quiz "What occurs when gametes fuse to form a diploid zygote?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fertilization occurs when a sperm and an egg fuse to form a diploid zygote" and "sperm and eggs are cells known as gametes". 

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


 

    fertilization       