Test Index

WAEC Biology 2019 Papers

Question : 47

Total: 50

Solution:

Concept:

Each heterozygous blood group B parent has genotype

I^B i

, so the children show a 3:1 ratio of blood group B to blood group O.

Explanation:

The parents both have genotype

I^B i

Each parent produces gametes carrying either

I^B

i

The possible offspring genotypes are

I^B I^B

I^B i

I^B i

, and

ii

Out of 4 children, 3 will have blood group B and 1 will have blood group O.

Answer:

Three of them belong to blood group B.

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