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Which of these is listed as a Mendelian disorder?
ADown's syndrome
BTurner's syndrome
CKlinefelter's syndrome
DThalassemia
Answer & Solution
Correct answer: D. Thalassemia
1. Mendelian disorders are caused by alteration or mutation in a single gene.
2. Phenylketonuria, thalassemia, haemophilia and sickle cell anaemia are examples.
3. Thalassemia therefore belongs to this group.
4. Down's, Turner's and Klinefelter's syndromes are chromosomal rather than Mendelian.
_Source: NCERT Class 12 Biology Ch4 'Principles of Inheritance and Variation'_
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