Location of Sex-Linked Genes
Genes of sex-linked traits are present on:
- Sex-chromosomes — Correct Answer
- Autosomes
- Both
- None
Explanation:
Correct Answer: Sex-chromosomes
By definition, sex-linked traits have their governing genes physically located on sex chromosomes — X and Y in mammals, or Z and W in birds. This is what distinguishes sex-linked traits from sex-limited and sex-influenced traits (both autosomal).
Gene Location Summary for Sex-Related Traits
| Trait Type | Gene Location | Examples |
|---|---|---|
| Sex-linked | Sex chromosomes (X/Y or Z/W) | X-linked: Haemophilia, Colour-blindness; Y-linked: Hypertrichosis, TDF |
| Sex-influenced | Autosomes | Polled/horned Dorset sheep, Baldness in human |
| Sex-limited | Autosomes | Milk production, Egg production, Semen production |
X-linked vs Y-linked Inheritance
- X-linked inheritance: Through both male and female (criss-cross pattern)
- Y-linked (holandric) inheritance: Through male only — Father → Son → Grandson
📚 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.
