Pedigree analysis is very important in human beings because

Which of the following is a Mendelian disorder?

$A$ son of a colourblind father and a normal homozygous mother marries a daughter of a normal father and a heterozygous (carrier) mother. What will be the phenotype of their children?

Alkaptonuria is a disease where the urine is:

Both male and female have normal vision though their fathers were colour blind,and mothers did not have any gene for colour blindness. The probability of their daughter becoming colour blind is (in $\%$)

Which disorder is caused when the synthesis of the $\beta$-globin chain of hemoglobin is affected due to a single gene $HBB$,leading to a quantitative change in the hemoglobin structure?