There Are Three Alleles Controlling the ABO Blood Types

question 91

Multiple Choice

There are three alleles controlling the ABO blood types.IA and IB are codominant genes so that the combination IAIB produces the AB blood type.The third allele,i,is recessive to the other two alleles.Which of the following combinations of parents (with blood types on the left) and child (with blood type listed on the right) is NOT possible?  

• A) A ´ AB = B
• B) A ´ O    = A
• C) A ´ B    = O
• D) A ´ AB = O.
• E) A ´ AB = B.

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