Pattern of Criss-cross Inheritance
Criss-cross pattern of inheritance is seen in-
- Sex-linked traits — Correct Answer
- Sex-limited traits
- Sex influenced traits
- None of the above
Explanation:
Correct Answer: Sex-linked traits
Criss-cross inheritance is a hallmark pattern of sex-linked (X-linked) traits. The character passes from a parent of one sex to offspring of the opposite sex in the next generation — e.g., from an affected father to his carrier daughters, or from a carrier mother to her affected sons.
Types of Criss-Cross Inheritance
| Type | Pattern | Chromosome Basis |
|---|---|---|
| Diagenic | Father → Daughter → Grandson | X-linked; father passes X to daughter |
| Diandric | Mother → Son → Granddaughter | X-linked; carrier mother passes X to son |
Non-Criss-Cross (Same Sex) Inheritance
| Type | Pattern |
|---|---|
| Holandric | Father → Son → Grandson (Y-linked) |
| Hologenic | Mother → Daughter → Granddaughter (W-linked in birds) |
Why Other Options Are Wrong
- Sex-limited traits: Only expressed in one sex; genes on autosomes — no criss-cross pattern.
- Sex-influenced traits: Autosomal genes with different dominance in each sex — not a criss-cross inheritance pattern.
📚 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.
