Location of Sex-Influenced Trait Genes
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Question (English)
Genes controlling sex-influenced traits are present on:
- Sex-chromosomes
- Autosomes ✓ Correct
- Both sex chromosomes and autosomes
- Mitochondrial DNA
Explanation:
Correct Answer: Autosomes
From Table 6 in the notes: Genes of sex-influenced traits are present on autosomes. However, the expression of these autosomal genes is modified by the sex hormonal environment of the individual, leading to different phenotypic expression in males and females.
Classic Example: Horn Condition in Dorset Sheep
- In males: HH = horned, Hh = horned, hh = polled (H is dominant)
- In females: HH = horned, Hh = polled, hh = polled (H is recessive)
- The same heterozygous genotype (Hh) gives different phenotypes in males vs. females due to testosterone levels.
Other Sex-Influenced Examples (from notes)
- Baldness in humans (autosomal but expressed more in males due to androgens)
- Polled and horned condition in Dorset sheep
📚 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.
