| I. Downs syndrome is a genetic disorder resulting from bisomy of chromosome 21. |
| II. Klinefelters syndrome is an abnormality in man who are always sterile because of an extra X-chromosome. |
| III. Huntingtons disease is a sex-linked disorder more common in man because they have a single X-chromosome on which the give is born. |
| IV. Women generally do not suffer from haemophilia because its gene is borne on Y-chromosome. |
A) Only I
B) II and IV
C) II and III
D) Only IV
E) Only II
Correct Answer: B
Solution :
Statement III and IV are Incorrect. Woman generally do not suffer from haemophilia because it is X-linked recessive disorder\[({{X}^{n}}{{X}^{n}}).\] The genotype is rarely found in females in which both the alleles are haemophilic. Huntingtons disease is autosomal dominant disorder and not sex-linked.
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