What does the given symbol represent in a pedigree chart?

Select the incorrect match regarding the symbols used in Pedigree analysis:

If a colourblind woman marries a normal man whose father was colourblind,what are the chances of their son being colourblind (in $\%$)?

Hemophilia is more common in males because it is a:

Sickle cell anaemia is caused due to the substitution of

$A$ man whose father was colorblind marries a woman who has a colorblind mother and a normal father. What is the percentage probability of their male children being colorblind (in $\%$)?