What is the most likely explanation for the light skin and hair of people with PKU?
A) Too much phenylalanine interferes with the production of melanin.
B) Their expression levels of the genes that produce melanin are low.
C) They cannot adequately synthesize tyrosine, an important precursor of melanin.
D) Melanin is broken down by excess phenylalanine.
E) Phenylalanine interferes with the transport of melanin to the appropriate location.

Question

Quizplus · Accepted Answer

PKU inhibits the synthesis of tyrosine, which is a precursor for the production of melanin. Therefore, reduced levels of melanin lead to lighter skin and hair.

What Is the Most Likely Explanation for the Light Skin