A) Down's syndrome
B) Turner's syndrome
C) Sickle cell anaemia
D) Klinefelter's syndrome
Correct Answer: A
Solution :
| Abnormality | Cause | Characteristic |
| Down?s Syndrome | Trisomy of 21st autosome (45A + XX/XY | Mental retardation prominent head, flattened nasal bridge, habitually open mouth and projecting lower lips |
| Turner?s syndrome | Non-disjunction of sex chromosome \[\left( \begin{align} & 2n+45 \\ & 44\text{A + XO} \\ \end{align} \right)\] | Sterile female, Webbed neck, no breast development, no menstruation or egg production |
| Klinefelte r?s syndrome | Non-disjunction of sex chromosome \[\left( \begin{align} & 2n+45 \\ & 44\text{A + XXY} \\ \end{align} \right)\] | Gynalpcomatia in males, mentally defective, testes under developed. |
| Sickle cell anaemia | Molecular gene mutation of gene HBA | Sickle shaped RBCs. Do not transport \[{{O}_{2}}\] efficiently |
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