The Fact That Usher Syndrome Is an Autosomal Recessive Disorder

Multiple Choice

The fact that Usher syndrome is an autosomal recessive disorder means that

A) both parents must carry the gene,and there is a 50% chance of the child having the syndrome.
B) one parent can carry the gene,and there is a 25% chance of the child having the syndrome.
C) both parents must carry the gene,and there is a 25% chance of the child having the syndrome.
D) one parent can carry the gene,and there is a 50% chance of the child having the syndrome.