The most important example of point mutation is found in a disease called
Thalassemia
Night blindness
Down's syndrome
Sickle-cell anaemia
Select the incorrect statement with regard to haemophilia.
A colourblind man has a colourblind sister but a normal brother than phenotype of its parents is
Haemophilia $A$ is due to the absence of
One of the following is not true to haemophilia
Given is : $X$ is the chromosome with gene for haemophilia and $X$ is the chromosome with normal gene. Which of the following individuals will act as carrier for haemophilia