Assertion : Haemophilia is a recessive sex linked disease. Reason : Haemophilia occurs due to mutati

English

Gujarati

Hindi

4.Principles of Inheritance and Variation

medium

Assertion : Haemophilia is a recessive sex linked disease.

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

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

(AIIMS-2007)

Solution

Haemophilia also known as bleeder disease is an example of recessive sex linked inheritance in human beings. It is masked in heterozygous condition. The person suffering from this disease lack factors $VIII$ and $IX$ responsible for blood clotting. A small cut may lead to bleeding till death. Men are affected by this disease while women are the carriers. Mutation of a structural gene on chromosome number $15$ causes Marfan syndrome. This disease results in formation of abnormal form of connective tissues and characteristic extreme loosseness of joints.

Standard 12

Biology

Choose correct option.

$(i)$ The heterozygous female transmit the disease to son.

$(ii)$ Change in the shape of the $RBC$ from biconcave disc to elongated sickle like structure.

$(iii)$ Mentally retarded.

$(iv)$ Heamoglobin not formed proper amount in blood.

medium

A colour blind man marries the daughter of a colour blind person. Then in their progeny

medium

(AIIMS-1983)

In pedigree analysis, the square, blackened and horizontal lines represents

medium

If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father ? Comment.

medium

Which one is the incorrect statement with regard to the importance of pedigree analysis?

medium

(NEET-2013)

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

Solution

Similar Questions

Choose correct option. $(i)$ The heterozygous female transmit the disease to son. $(ii)$ Change in the shape of the $RBC$ from biconcave disc to elongated sickle like structure. $(iii)$ Mentally retarded. $(iv)$ Heamoglobin not formed proper amount in blood.

A colour blind man marries the daughter of a colour blind person. Then in their progeny

In pedigree analysis, the square, blackened and horizontal lines represents

If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father ? Comment.

Which one is the incorrect statement with regard to the importance of pedigree analysis?

Start a Free Trial Now

Assertion : Haemophilia is a recessive sex linked disease.

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

Choose correct option.

$(i)$ The heterozygous female transmit the disease to son.

$(ii)$ Change in the shape of the $RBC$ from biconcave disc to elongated sickle like structure.

$(iii)$ Mentally retarded.

$(iv)$ Heamoglobin not formed proper amount in blood.