A) Down's syndrome
B) Turner's syndrome
C) Sickle cell anaemia
D) Klinefelter's syndrome
Correct Answer: A
Solution :
| S.No | Abnormality | Cause | Characteristie |
| 1. | Down?s syndrome | Trisomy of 21st autosome (45 A + XX / XY) | Mental retardation prominent head, flattened nasal bridge, Habitually open mouth and projecting lower lips. |
| 2. | Turner?s syndrome | Non-disjuncti on of sex chromosome \[\left( _{44A+XO}^{2n\,=\,45} \right)\] | Sterile female, webbed neck, no breast development, no menstruation or egg production. |
| 3. | Klinefelter?s syndrome | Non-disjuncti on of sex chromosome \[\left( _{44A+XXY}^{2n\,=\,47} \right)\] | Gynecomastia in males, mentally defective, testes underdeveloped. |
| 4. | Sickle cell anaemia | Molecular gene mutation of gene HbA | Sickle shaped RBCs? do not transport O2 efficiently. |
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