Alkaptonuria is a disease where the urine is:

Sickle cell anemia is a/an.....

What is the probability of having a color-blind male child from two normal parents?

$A$ 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?

Among symbols $A, B$ and $C$,what does $C$ indicate?

Colour blindness is