Which of the following is a genetic disorder?

In humans,a gene located on the $X$-chromosome can be responsible for:

Colour blindness is caused due to

$A$ couple,both carriers for the gene of sickle cell anaemia,are planning to get married. What are the chances of them having an anaemic child (in $\%$)?

Both a man and a woman are affected by Vitamin $D$-resistant rickets,which is an $X$-linked dominant trait. All the daughters of this couple are affected by rickets,but some of the sons are not. What are the genotypes of the parents?

Choose the correct option for the offspring of a colorblind woman and a normal man.