Phenylketonuria (PKU) is a disorder caused by a defect in the gene that codes for the phenylalanine hydroxylase (PAH), an enzyme required to break down the amino acid phenylalanine. The results of a newborn screening test indicated that Jack and Jill’s baby has phenylketonuria (PKU). Neither Jack nor Jill has PKU. A DNA test indicated that there was no switching of babies - Jack and Jill are the baby's real parents. How is this possible? A. Jack and Jill are both heterozygous for the gene that codes for PAH. B. Jack and Jill are both homozygous for the normal allele that codes for PAH. C. One parent is heterozygous for the gene for PAH, the other parent is homozygous for the normal allele. D. One parent is heterozygous for the gene for PAH, the other parent is homozygous for the defective allele.
Phenylketonuria (PKU) is a disorder caused by a defect in the gene that codes for the phenylalanine hydroxylase (PAH), an enzyme required to break down the amino acid phenylalanine. The results of a newborn screening test indicated that Jack and Jill’s baby has phenylketonuria (PKU). Neither Jack nor Jill has PKU. A DNA test indicated that there was no switching of babies - Jack and Jill are the baby's real parents. How is this possible?
A. Jack and Jill are both heterozygous for the gene that codes for PAH.
B. Jack and Jill are both homozygous for the normal allele that codes for PAH.
C. One parent is heterozygous for the gene for PAH, the other parent is homozygous for the normal allele.
D. One parent is heterozygous for the gene for PAH, the other parent is homozygous for the defective allele.
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