How do people inherit Glycogen storage disease?

As mentioned in the introduction, excess glucose is converted to glycogen, and vice versa. These two processes require many different enzymes. Thus, if one of these enzymes is defective, the conversion process stops. This becomes a glycogen storage disorder. Most, but not all glycogen storage disorders are inherited in a pattern called autosomal recessive inheritance-in which a child inherits a defective allele from each parent.

Glycogen storage disorders are rare. It is estimated to occur once in every 20,000 to 40,000 babies born. They are passed on in families through their genes.

If both parents carry the defective gene, there is:

1) 25% chance that their child will develop the disease.

2) 50% chance that the child will receive one defective gene from one of the parents. (Carrier of the disease only- child will not suffer from this disease)

3) 25% chance that child will receive both normal genes, one from each parent.