Y-linked refers to genes located on the Y chromosome, one of the two sex chromosomes in humans and many other organisms. These genes are typically involved in male sex determination and spermatogenesis, meaning they play a crucial role in the development of male characteristics and the production of sperm. Only males inherit Y-linked traits, as they possess one Y chromosome and one X chromosome, while females have two X chromosomes. This means that any traits or disorders linked to the Y chromosome are passed directly from father to son, making Y-linked inheritance a straightforward pattern in genetics.