Traits Inherited Solely Through Males
Genes of testis-determining factor (TDF) & hypertrichosis are present on Y-chromosome & inheritance of these characters are only through male so these characters are known as:
- Hologenic character
- Diandric character
- Holandric character — Correct Answer
- Diagenic character
Explanation:
Correct Answer: Holandric character
Traits governed by genes on the Y chromosome in mammals are called Holandric characters. Since only males have the Y chromosome, these traits pass exclusively from father to son to grandson.
Types of Sex-Linked Inheritance — Criss-Cross vs Non-Criss-Cross
| Category | Type | Pattern |
|---|---|---|
| Criss-cross (opposite sex) | Diagenic | Father → Daughter → Grandson |
| Diandric | Mother → Son → Granddaughter | |
| Non-criss-cross (same sex) | Holandric | Father → Son → Grandson (Y-linked) |
| Hologenic | Mother → Daughter → Granddaughter (W-linked in birds) |
Examples
- Y-linked (Holandric): Hypertrichosis (excess hair on ear pinna), Testis-Determining Factor (TDF)
- X-linked: Haemophilia, Colour-blindness (criss-cross / Diagenic / Diandric inheritance)
📚 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.
