Location of Sex-Limited Genes
Genes of sex-limited traits are present on:
- Sex-chromosomes
- Autosomes — Correct Answer
- Both
- None
Explanation:
Correct Answer: Autosomes
Genes controlling sex-limited traits are located on autosomes. Both sexes carry these genes, but due to physiological (hormonal/anatomical) differences, expression is restricted to only one sex.
Sex-Limited Traits — Key Features
- Genes on autosomes (both sexes carry them)
- Trait expressed in only one sex
- Responsible for sexual dimorphism
- Examples: Milk production (female), egg production (female), semen production (male), secondary sexual characters
Why the Distinction Matters in Animal Breeding
- Since bulls cannot express milk production, they must be evaluated through their daughters (progeny testing).
- Selection index and progeny testing are most effective for sex-limited traits.
- Individual selection cannot be used for sex-limited traits in the sex that does not express them.
📚 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.
