" How can a female be colourblind? "

How can a female be colour blind ?

If a normal man marries a carrier female for colour blindness, what is the chance of their male progeny to be colourblind.

If all the sons of a couple are colourblind then

A colourblind man marries a normal vision woman whose father was colourblind. They have a first child as a son. What are the chances that a child would be colourblind.

A colourblind man marries a normal vision woman whose father was colourblind. They have a first child as a son. What are the chances that a child would be colourblind.

A man whose father was colourblind marries a woman, who had a colourblind mother and normal father. What percentage of male children of this couple will be colourblind?

A colourblind man has a colourblind sister but a normal brother than phenotype of its parents is

Red - green colour blindness in human beings is goverend by a sex - linked recessive gene. A normal woman whose father was colourblind marries a colourblind man . What proportion of their sons is expected to be colourblind ?