Which one of the following is a dominant trait?

What does the given symbol represent?

$A$ color-blind daughter is born only when:

In man,the genetic disorder 'Aniridia' (congenital absence of the iris) occurs due to:

Hemophilia is more common in human males than in females because it is a:

$A$ woman is a carrier for hemophilia (having one gene on each $X$ chromosome) and also carries one gene for color blindness on one $X$ chromosome. She marries a normal man. What will be the phenotype of their offspring?