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Pick out the correct statements: (i) Hae...

Pick out the correct statements: (i) Haemophilia is a sex-linked recissive disease.
(ii) Down's syndrome is due to aneuploidy.
(iii) Phenylketonuria is an autosomal recessive gene disorder.
(iv) Sickle cell anaemia is an X-linked recessive gene disorder.

A

a,b and c are correct

B

a and d are correct

C

b and d are correct

D

a,c,d are correct

Text Solution

Verified by Experts

The correct Answer is:
A
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Pick out the correct statements: (i) Colour blindness is a sex - linkes recessive gene disorder (ii) Klinefelter's syndrome is 18^(th) chromosomal trisomy (iii) Phenylketonuria is an autosomal dominant gene disorder (iv) Down's syndrome is due to aneuploidy

As: Haemophilia is a sex linked disease R: Haemophilia is due to a recessive gene.

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Assertion (A) : Haemophilia is a recessive sex linked disease. Reason (R ) : Haemophilia occurs due to mutation of a structural gene on chromosome 15.

Read the following statements and choose the correct option I. Failure of segregation of chromatids during cell division results in aneuploidy (II) Chromosomal disorders are mainly determined buy alteration or mutation in a single gene (III) Thalassemia and cystic fibrosis are Mendelian disorders (IV) Sickle cell anemia is an X- linked trait ltbvrgt (V) Haemophilia is an autosome linked recessive disease

Assertion :- Most of the X-linked disorders can not be eliminated easily from nature and our gene pool. Reason : X-linked dosorders are due to recessive genes.