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Turner's syndrome is caused by
Again of an X chromosome
Bloss of an X chromosome
Closs of chromosome 21
Dgain of chromosome 21
Answer & Solution
Correct answer: B. loss of an X chromosome
1. Sex chromosome disorders come from a missing or extra X.
2. Turner's syndrome results from the loss of an X chromosome.
3. Klinefelter's syndrome, by contrast, comes from an additional X.
4. Chromosome 21 is involved in Down's syndrome, not in Turner's.
_Source: NCERT Class 12 Biology Ch4 'Principles of Inheritance and Variation'_
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