Codominance
Human ABO blood group inheritance displays which pattern between IA and IB alleles?
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About This Question
- Subject
- biology
- Chapter
- genetics and evolution
- Topic
- codominance
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Codominance
- Multiple Alleles: The ABO blood group is controlled by gene I, which has three alleles: IA,IB, and i.
- Dominance Relationships:
- Both IA and IB are completely dominant over i.
- Between IA and IB, Codominance is observed.
- Effect: When an individual has both alleles (IAIB), both types of sugars (Antigen A and Antigen B) are expressed on the surface of red blood cells, resulting in Blood Group AB.
- Conclusion: Neither allele masks the other; they are expressed together.
This medium difficulty biology question is from the chapter genetics and evolution, covering the topic of codominance. It appeared in the 2025 exam.
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