DP Biology (first assessment 2025)

Test builder »

Question 19N.2.SL.TZ0.7b

Select a Test
Date November 2019 Marks available [Maximum mark: 4] Reference code 19N.2.SL.TZ0.7b
Level SL Paper 2 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 4]
19N.2.SL.TZ0.7b
(b)

Outline how two parents could have a child with any of the four ABO blood groups.

[4]

Markscheme

a. IA, i for one set of gametes/parental genotype ✔

b. IB, i for the other set of gametes/parental genotype ✔

c. «genotypes of offspring are» IAIB, IAi, IBi, ii ✔

d. «phenotypes of offspring are» AB, A, B, O ✔

Answers can be given in a Punnett grid or in prose.

Accept the four possible blood groups of the offspring anywhere in the answer.

Syllabus sections