The ABO Blood Groups in Humans Are Determined by a Multiple

question 102

Multiple Choice

The ABO blood groups in humans are determined by a multiple allelic system in which I^A and I^B are codominant and are dominant to i^O. If an infant born to a type O mother also is type O, possible genotypes for the father are

• A) O or A.
• B) A or B.
• C) O only.
• D) O, A, or B.
• E) impossible to determine.

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