Sickle-cell anemia is a genetic disease caused by the presence of a faulty hemoglobin gene (HbS). The normal version of this gene is HbA. Which of the following is TRUE about HbS and HbA?
a) It is impossible for a person to carry two HbS genes.
b) Hemoglobin genes are always inherited from one's mother.
c) People carrying two HbS genes smell like rotten fish.
d) They're both alleles for the same trait.
e) A person with two HbS genes would be a silent carrier.
Ans: d) They're both alleles for the same trait.
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Fill in the blank(s) with correct word