Why Did Garrod Define Alkaptonuria as a Recessive Genetic Disease

Why did Garrod define alkaptonuria as a recessive genetic disease?

A) It is expressed in male members of an affected family.
B) It is expressed in all members of an affected family.
C) It is expressed under certain environmental conditions.
D) It is expressed when two alleles for the disease are present.
E) It is expressed when one of the two alleles carries the disease trait.

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