IB Biology SL 2.5.9 ABO blood groups and codominance Question Bank

a. multiple alleles

OR

(the alleles are) \|^A, I^B, i;

b. I^A and I^B (alleles) are codominant to each other

OR

I^A I^B (genotype) gives blood group/type AB ;

c. i (allele) is recessive to both I^A and I^B (alleles)

OR

I^A and I^B (alleles) are dominant to i (allele)

OR

I^A i (genotype) gives blood group/type A and I^B i (genotype) gives blood group/type B;

d. 4 blood groups/types: A, B, AB, O;

e. there are no intermediate blood groups/types;

a. Correct symbols required for the mark, but can be stated in different parts of the answer. Do not accept I for i for this mark.

a., b. and c. Do not accept blood groups/types / genes for alleles.

d. All four blood groups needed for the mark, but can be stated in different parts of the answer.

e. Accept OWTTE.

3

Marking guidance:

max