MHT CET 202625 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 25 April
- Shift
- Morning Shift
- Subject
- Biology
- Chapter
- Principles of Inheritance and Variation
MHT CET 2026 · 25 April · Morning Shift · Biology · Principles of Inheritance and Variation
Which one of the following does NOT show non-allelic interaction?
Which one of the following does NOT show non-allelic interaction?
Options
- APleiotropy
- BCo-dominance
- CPolygenes
- DComplementary genes
Correct answer
B. Co-dominance
Step-by-step solution
Gene interactions can be broadly classified into two types: allelic (intragenic) and non-allelic (intergenic) interactions.
Allelic interactions occur between alleles of the same gene. Examples include incomplete dominance, co-dominance, and multiple alleles. In co-dominance, both alleles of a single gene are fully expressed in a heterozygote, making it a classic example of an allelic interaction.
Non-allelic interactions occur between alleles of different genes. Examples include epistasis, complementary genes, supplementary genes, and polygenic inheritance (polygenes).
Since co-dominance is an intragenic (allelic) interaction, it does not show non-allelic interaction.
Answer: Co-dominance
Allelic interactions occur between alleles of the same gene. Examples include incomplete dominance, co-dominance, and multiple alleles. In co-dominance, both alleles of a single gene are fully expressed in a heterozygote, making it a classic example of an allelic interaction.
Non-allelic interactions occur between alleles of different genes. Examples include epistasis, complementary genes, supplementary genes, and polygenic inheritance (polygenes).
Since co-dominance is an intragenic (allelic) interaction, it does not show non-allelic interaction.
Answer: Co-dominance