Read before you practise · 2 min
Read ABO and Rh Inheritance Together
ABO alleles and Rh status are inherited as separate blood-group systems.
NSEB · Principles of Inheritance and Variation · 1 linked question · 100% coverage
Know this first
Blood Group Inheritance is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Study deeper: NCERT Biology · Principles of Inheritance and Variation
Track the ABO alleles
An AB parent passes A or B; an O parent passes O. Their children can be A or B, never AB or O.
Treat Rh separately
Rh-positive phenotype can result from one or two dominant D alleles; without parental genotypes, a Rh-positive child can be possible even if not guaranteed.
OlympIQ exam lens
- ✓AB × O gives A or B.
- ✓ABO and Rh are separate inheritance systems.
OlympIQ trap
Do not infer a guaranteed Rh phenotype when one parent genotype is unspecified.
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