Term for One Gene Masking Another Non-Allelic Gene
When one gene masks the expression of another non-allelic gene, it is known as:
- Dominance
- Linkage
- Epistasis — Correct Answer
- Pleiotropy
Explanation:
Correct Answer: Epistasis
Epistasis is the phenomenon where one gene (epistatic gene) masks or suppresses the expression of another non-allelic gene (hypostatic gene). It is a type of non-allelic (intergenic) interaction.
Types of Epistasis and F₂ Phenotypic Ratios
| Type | F₂ Ratio |
|---|---|
| Dominant epistasis | 12:3:1 |
| Recessive epistasis / Supplementary gene action | 9:3:4 |
| Complementary gene action | 9:7 |
| Duplicate gene action | 15:1 |
| Inhibitory gene action | 13:3 |
| Collaborative gene action | 9:3:3:1 |
Dominance is allelic (intragenic) interaction; Epistasis is non-allelic (intergenic) interaction — key distinction.
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
