The following pedigree chart shows:

$A$ normal woman,whose father was colour blind,marries a normal man. What is the chance of occurrence of colour blindness in the progeny (in $;\%$)?

$A$ normal woman,whose father was colourblind,marries a normal man. What kinds of children can be expected and in what proportion?

$A$ normal girl, whose mother is haemophilic, marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offsprings?
$(a)$ Haemophilic son and haemophilic daughter.
$(b)$ Haemophilic son and carrier daughter.
$(c)$ Normal daughter and normal son.
$(d)$ Normal son and normal daughter.
Choose the most appropriate answer from the options given below:

How many types of genotypes are observed in sickle cell anemia?

Which of the following is not $X$-linked recessive?