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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 fail- ure to oxidise an amino acid (Phenylalanine) to tyrosine because of a defecitve enzyme.
[R]: It resulted the 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

Text Solution

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The correct Answer is:
A
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Read the following statements and choose the correct option. (i) In phenylketonuria the affected person does not secrete the enzyme to convert phenylalanine to tyrosine. (ii) The possibility of a male becoming haemophilic is extremely rare. (iii) Sickle cell anemia is caused by the substitution of glutamic acid by valine at the fifth position of beta chain of haemoglobin molecule. (iv) Myotonic dystrophy is an autosomal dominant trait.

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  2. [A]: Genetic disorder, sickle cell anaemia is common in new born babie...

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  3. [A]: PKU is a autosomal recessive hereditary metabolic disease caused ...

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  5. [A]: When doing genetics problems, firs de- cide the appropriate key a...

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  6. [A]: Chromosomes are divided into hetero- chromatin and euchromatin pa...

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  7. [A]: Metacentric chromosomes are V-shaped [R]: In these chromosomes...

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  8. Assertion : Plasmids are double-stranded extra chromosomal DNA. Reas...

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  9. [A]: Exchange of genetic material occurs dur- ing meiosis. [R]: The...

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  10. Assertion:XXX females are called super females Reason : They often g...

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  11. [A]: A gene affecting the expression of an- other nonallelic gene is c...

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  12. [A]: The sex linked genes are passed on to the grandson through the da...

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  13. Assertion : Muatations are necessary for the survial to the species. ...

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  15. [A]: Neurospora is an ideal genetic material for research. [R]: Bec...

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  16. [A]: Heterosis is superiority of F1 hybrid over its two genetically d...

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  17. [A]: Mendelian recombinations are due to crossing over. [R]: Crossi...

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  19. [A]: Chromosomes appear longer during te-lophase. [R]: The term chr...

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  20. [A]: Copy choice theory for crossing over was propos'ed by Belling. ...

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