Barr Bodies in Turner Syndrome
Number of barr-body in turner syndrome-
- — Correct Answer
- 1
- 2
- 3
Explanation:
Correct Answer: 0 (Zero Barr bodies)
In Turner Syndrome, the chromosomal constitution is 45 (44 + XO) — only one X chromosome.
Formula: Number of Barr bodies = Number of X chromosomes − 1
Turner: 1 X − 1 = 0 Barr bodies
Barr Body Count in Various Syndromes
| Condition | Chromosomes | X count | Barr bodies |
|---|---|---|---|
| Turner Syndrome | 45 (44 + XO) | 1 | 0 |
| Normal Female (XX) | 46 | 2 | 1 |
| Normal Male (XY) | 46 | 1 | 0 |
| Klinefelter Syndrome (XXY) | 47 (44 + XXY) | 2 | 1 |
| Super Female (XXX) | 47 (44 + XXX) | 3 | 2 |
Sex Chromosome Abnormalities in Human
| Syndrome | Chromosomal Condition |
|---|---|
| Klinefelter's syndrome | 47 (44 + XXY) |
| Turner syndrome | 45 (44 + XO) |
| Super male / Jacob's syndrome | 47 (44 + XYY) |
| Super female | 47 (44 + XXX) |
📚 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.
