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Garrod hypothesized that "inborn errors of metabolism" such as alkaptonuria occur because _____.

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Garrod hypothesized that individuals who could not metabolize protein could not produce the enzyme in their bodies. He was the first to identify the condition as a genetic disorder. Others thought it was caused by a bacterial infection. He came to this conclusion by noticing that the disease was more common in families where marriage between relatives was common. 
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