Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): | A father will never pass the gene for haemophilia to his sons |
Reason (R): | Haemophilia is sex-linked (X-linked recessive trait). |
In the light of the above statements, choose the correct answer from the options given below :
1. | (A) is correct but (R) is not correct. |
2. | (A) is not correct but (R) is correct. |
3. | Both (A) and (R) are correct and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are correct but (R) is not the correct explanation of (A). |
Statement I: | Sickle cell anaemia and Haemophilia are autosomal dominant traits. |
Statement II: | Sickle cell anaemia and Haemophilia are disorders of the blood. |
(a) | Haemophilic son and haemophilic daughter. |
(b) | Haemophilic son and carrier daughter. |
(c) | Normal daughter and normal son. |
(d) | Normal son and haemophilic daughter. |
I: | Haemophilia is a sex-linked recessive 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 |
Which of the following most appropriately describes haemophilia?
1. X-linked recessive gene disorder
2. Chromosomal disorder
3. Dominant gene disorder
4. Recessive gene disorder
The incorrect statement with regard to Haemophilia is:
1. | It is a recessive disease |
2. | It is a dominant disease |
3. | A single protein involved in the clotting of blood is affected |
4. | it is a sex-linked disease. |
Which of the following is not a hereditary disease:
1. Haemophilia
2. Cretinism
3. Cystic fibrosis
4. Thalasasemia
What ratio is expected in offsprings if father is colour blind and mother's father was colour blind:
1. 50% daughter – colour blind
2. All the sons are colour blind
3. All the daughters colour blind
4. All the sons are normal
Among fraternal twins, one baby is haemophilic while the baby's brother is normal. Which statement is true:
1. Baby is male
2. Baby is female
3. Mother is heterozygous
4. Mother is homozygous