Give scientific reasons : product of phenylalanine catabolism excreted in urine in phenylketonuria.

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4.Principles of Inheritance and Variation

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Give scientific reasons : The product of phenylalanine catabolism excreted in the urine in phenylketonuria.

Option A

Option B

Option C

Option D

Solution

It is a rare disease in which individual lacks an enzyme called Phenylalanine hydroxylase. Which is needed to breakdown an essential amino acid phenylalanine into tyrosine in liver. This phenylalanine is accumulated and gets converted into phenylpyruvic acid and other derivatives

leading to mental retardation (due to accumulation in brain). These are also excreted through urine because of its poor absorption by kidney.

Standard 12

Biology

If a boy's father has haemophilia and his mother has one gene for haemophilia; what is the chance that the boy will inherit the disease

medium

(AIIMS-1999)

Assertion : Haemophilia is a recessive sex linked disease.

Reason : Haemophilia occurs due to mutation of a structural gene on chromosome $15$.

medium

(AIIMS-2007)

Gene for colourblindness is located on

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In pedigree analysis, symbol given for sex unspecified is

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A couple whose sons are colourblind with $AB$ blood group, identify the parents from the following..

medium

Give scientific reasons : The product of phenylalanine catabolism excreted in the urine in phenylketonuria.

Solution

Similar Questions

If a boy's father has haemophilia and his mother has one gene for haemophilia; what is the chance that the boy will inherit the disease

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

Gene for colourblindness is located on

In pedigree analysis, symbol given for sex unspecified is

A couple whose sons are colourblind with $AB$ blood group, identify the parents from the following..

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Assertion : Haemophilia is a recessive sex linked disease.

Reason : Haemophilia occurs due to mutation of a structural gene on chromosome $15$.