Individuals have multiple DNA sequences. A patient with ABO blood type has:
A) Multiple alleles
B) Single alleles
C) Antigens
D) Increased immunity
Ans: A
Feedback: Careful examination of DNA sequences from many people shows that these sequences have multiple versions in our population. These different versions, or sequence variations, are called alleles. Sequences found in many forms are said to be polymorphic, meaning that there are at least two common forms of a particular gene. Human beings with ABO blood type have multiple alleles. Antigen and antibody response occurs to increase the patient's immunity. A mutation of one single allele would not produce ABO blood type.
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