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[A]: PKU is a autosomal recessive heredi...

[A]: PKU is a autosomal recessive hereditary metabolic disease caused by the body's failure to oxidise an amino acid (Phenylalanine) to tyrosine because of a defective enzyme.
[R]: It result inthe presence of phenylpyruvic acid in the urine.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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State True of False (i) Hetrozygous female for haemophilia may transmit the disease to sons (ii) Affected individuals with phenylketonuna lack an enzyme that converts the amino acid phenylalanine into phenylpyruvic acid (iii) Klinefelter's syndrome is caused due to the presence of an additional copy of X-chromosome resulting into a karyotype of 47//XXX (iv) Failure of segregation of homologous pair of chromosomes during cell division cyclic results in Turner's syndrome.

Read the following statement s and choose the correct option In phenylketonuria the affected person does not secrete the enzyme to convert phenylalanine to tyrosine (II)Possibility of male becoming haemophiliac is extremely rare (III) Sickle cell anaemia is caused by the substitution of glutamic acid by valine at fifth position of beta chain of haemoglobin (IV) Myotonic dystrophy is an autosomal dominant trait

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