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ashleyhen6753 ashleyhen6753
wrote...
Posts: 762
Rep: 1 0
6 years ago
Phenylketonuria is caused by __________.
 
  a. a single point mutation
  b. a dominant allele
  c. environmental factors such as diet
  d. a recessive allele
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Replies
wrote...
6 years ago
Correct Answer: d
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