Select the correct pair:

Both husband and wife have normal vision,though their fathers were colourblind and mothers did not have any gene for colour blindness. The probability of their daughter becoming colourblind is

Which of the following disorders is characterized by mental retardation?

In a normal couple,half of the sons are hemophilic and half of the daughters are carriers. Where is the gene located?

When a hemophilic male $(X^h Y)$ marries a carrier female $(X^H X^h)$ for hemophilia,what are the chances of all daughters born being normal (in $\%$)?

Study the given pedigree chart.