A single gene disorder
What is it?
Galactosemia is a rare disability that affects the body in a way that it is not able to break down glucose which is necessary for the cell to get food. Most people that have Galactosemia are missing enzyme that is necessary is chemical reaction of cellular respiration.
How do people get it?
It is passed down in a recessive pattern. In order to get Galactosemia a child needs to inherit one defective copy of the gene from each parent. When a child receives a normal one and a defective ones he becomes a so-called carrier, but he is not infected.