Fact 1: Mutations may change the structure of a chromosome or just change a single nucleotide.

Fact 2: Mutations in genes on the Y chromosome have been implicated in male genetic infertility.

Given the two facts above, answer the question "What does changes in the structure of the Y chromosome do?" with the following options: 
- reproduce
 - Male infertility
 - harm them
 - bending light rays
 - It expands
 - allow growth
 - Plant growth is reduced
 - Damages them


 

  Male infertility       