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A child is born with albinism, an inability to produce or deposit the pigment protein, melanin, in skin cells, as well as other pigment-containing​ cells of the body. His parents do not display the trait of albinism.

Which of the following explains how this is possible?

A

The child has only one allele for skin pigmentation, though his parents each have two. Having fewer genes produces his albino characteristics.

B

A spontaneous mutation, not present in either parent, has resulted in the child producing the albino protein. The albino protein displaces the normal melanin.

C

The normal DNA from both parents has combined to produce a new form of DNA in the child. This abnormal DNA codes for the albino protein.

D

The parents each have one normal DNA allele and one that codes for albinism. The parents produce enough normal melanin protein to allow normal skin color, but the child cannot.

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