Which hereditary disease condition is characterized by the failure of blood to coagulate?

Color blindness is a ..... trait.

Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.

Select the correct trait from the given pedigree chart.

Which is not a Mendelian disorder in man?

$A$ woman with normal vision,but whose father was colour blind,marries a colour blind man. Suppose that the fourth child of this couple is a boy. What is the probability of this boy being colour blind?