Test Index

WAEC Biology 2013 Papers

Question : 42

Total: 52

Solution:

Concept:

A child with blood group O must have the genotype

ii

, meaning the child needs an

i

allele from each parent.

Explanation:

The man has blood group AB, so his genotype is

I^A I^B

He does not carry the

i

allele at all.

During gamete formation, he can pass on only

I^A

I^B

to his offspring.

He can never pass on an

i

allele.

For a child to have blood group O, the child must inherit

i

from both the father and the mother.

Since the father cannot provide an

i

allele, the required genotype

ii

cannot be formed.

Hence, the probability of having a child with blood group O is impossible in this case.

Answer:

0\%

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