Persons who are colourblind cannot distinguish between which of the following colours?

$A$ normal-visioned man whose father was colour-blind,marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind?

In the $\beta$-globin chain of haemoglobin of an individual,if the sixth amino acid,Glutamic acid (Glu),is replaced by Valine (Val),then the individual will be suffering from:

$A$ color-blind man marries a woman with normal vision,whose family has no history of color blindness. What is the probability that their daughter's children (grandsons and granddaughters) will be color-blind?

$A$ husband and wife have normal vision,but the fathers of both of them were colour blind. What is the probability of their first daughter being colour blind (in $\%$)?

Which type of abnormality is seen in the given pedigree chart?