A mother has blood group A, the father has blood group AB, and their child has blood group A. What can be the possibility of genotypes of all three, respectively? A. I^A I^A | I^A I^B | I^A I^A B. I^A i | I^A I^B | I^A

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Quantrex Academy · Accepted Answer

Correct answer: C. A and B

The blood group of the mother is A, so her genotype can be

I^A I^A

or

I^A i

.

The blood group of the father is AB, so his genotype must be

I^A I^B

.

The blood group of the child is A, so the child's genotype can be

I^A I^A

or

I^A i

.

Evaluating the given statements:

A.

I^A I^A | I^A I^B | I^A I^A

: The child inherits

I^A

from the mother and

I^A

from the father. This is possible.

B.

I^A i | I^A I^B | I^A i

: The child inherits

i

from the mother and

I^A

from the father. This is possible.

C.

I^A I^A | I^A I^B | I^A i

: The child has an

i

allele, but neither parent has an

i

allele. This is not possible.

D.

I^A i | I^B i | I^A i

: The father's genotype is given as

I^B i

(blood group B), which contradicts the given blood group AB. This is not possible.

E.

I^A i | I^A I^B | I^B i

: The child's genotype is given as

I^B i

(blood group B), which contradicts the given blood group A. This is not possible.

Therefore, only A and B represent possible genotypes for the mother, father, and child respectively.

Answer: A and B

A mother has blood group A, the father has blood group AB, and...

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