Suppose that a child developed mild symptoms of sickle-cell anemia. It may be correctly inferred that
A) the child is heterozygous for the sickle-cell trait.
B) the child received the sickle-cell trait from both parents and is homozygous for this disorder.
C) the sickle trait is absent from the child's alleles.
D) the symptoms developed from experiential learning.
Correct Answer:
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