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?

Choose from:
1). reproduce
2). Male infertility
3). harm them
4). bending light rays
5). It expands
6). allow growth
7). Plant growth is reduced
8). Damages them
Answer:
2).