Q.

 Pick out the correct statements.

(1) Haemophilia is a sex-linked recessive disease.

(2) Down's syndrome is due to aneuploidy.

(3) Phenylketonuria is an autosomal recessive gene disorder.

(4) Sickle cell anaemia is an X-linked recessive gene disorder.

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a

(1), (3) and (4) are correct.

b

(1), (2) and (3) are correct.

c

 (1) and (4) are correct.

d

(2) and (4) are correct.

answer is B.

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Detailed Solution

Haemophilia is a sex-linked recessive disease. 

Down's syndrome is due to aneuploidy.

Phenylketonuria is an autosomal recessive gene disorder.

Sickle cell anaemia is an autosomal recessive gene disorder.

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