Principles of Inheritance and Variation Question 180

180. Which of the following is correct match?

[2002]

(a) Down’s syndrome -21 st chromosome

(b) Sickle cell anaemia - X-chromosome

(c) Haemophila - Y-chromosome

(d) Parkinson disease $-X & Y$ chromosome

Show Answer

Answer : a

Hints & Solution

(a) Sickle cell anaemia is a genetic disorder caused by a defective allele on chromosome 11 . Hemophilia is a sex linked recessive disorder. Down’s syndrome is caused by trisomy of the $21^{\text{st }}$ chromosome.