Persons with Type II usually learn to walk around the age of 12 months. As more information on Type III becomes available, a clearer picture of vestibular function will emerge. Usher Syndrome is a genetic condition. When the genes from the mother and father come together in the fertilized egg cell, they arrange themselves in pairs. Genes provide the information that allows this single cell to grow into a human being.
Genes always come in pairs.
The pair is made up of one gene from the mother and one from the father. In turn, parents pass only one gene from each pair to each of their children. Which gene the child receives from a parent is determined randomly. Just as when we flip a coin, whether it comes up heads or tails is a random event. Occasionally, something happens that causes a gene to change.