Matching Sex Chromosome Configurations
Which of the following pair is correctly matched-
- XY - Heterozygous condition
- XX - Homozygous condition
- XO - Hemizygous condition
- All the above — Correct Answer
Explanation:
Correct Answer: All the above
All three pairs are correctly matched:
| Sex Chromosome Configuration | Zygosity | Explanation |
|---|---|---|
| XY | Heterozygous | Two different chromosomes (X ≠ Y) |
| XX | Homozygous | Two identical chromosomes (X = X) |
| XO | Hemizygous | Only one chromosome present at that locus |
Sex Chromosome Types in Animals
| Type | Male | Female | Examples |
|---|---|---|---|
| XY type | XY | XX | Humans, Cattle, Pig, Sheep |
| ZW type (reversed) | ZZ | ZW | Poultry (Chicken, Duck, Turkey) |
- In poultry: males are ZZ (homogametic) and females are ZW (heterogametic) — opposite of mammals.
- XO (Turner syndrome) — hemizygous condition: 45 (44 + XO).
📚 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.
