Correct Pairings in Genetics
Which of the following pair is/are correctly matched-
- Exon: Coding sequence
- Intron: Non-coding sequence
- High $h^{2}$ of a trait: Low heterosis
- All the above — Correct Answer
Explanation:
Correct Answer: All the above
All three pairings are scientifically accurate and from the genetics notes.
Verification of Each Pair
| Pair | Explanation |
|---|---|
| Exon — Coding sequence | Exons are the expressed portions of a gene that are retained after RNA splicing and translated into protein. They are the functional coding sequences. |
| Intron — Non-coding sequence | Introns (intervening sequences) are transcribed into pre-mRNA but spliced out before translation. They are non-coding sequences. |
| High h² → Low heterosis | Traits with high narrow-sense heritability are governed primarily by additive gene action; heterosis depends on non-additive gene action (dominance, over-dominance, epistasis). Therefore: high h² ↔ low heterosis; low h² ↔ high heterosis (inverse relationship) |
Heritability–Heterosis Inverse Relationship
- Traits with low h² (reproductive traits): high heterosis — maximum benefit from crossbreeding
- Traits with high h² (carcass quality, fleece): low heterosis — selection works better than crossbreeding
📚 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.
