Identify the odd one among the following disorders.

Phenylketonuria is an inborn error of metabolism that is inherited as:

Which one of the following techniques is employed in human genetic counselling?

$A$ man whose father was colorblind marries a woman who has a colorblind mother and a normal father. What is the percentage probability of their male children being colorblind (in $\%$)?

If a colour blind man marries a normal visioned woman,what is the percentage of offsprings showing colour blindness phenotypically (in $\%$)?

Which of the following disorders can occur if the protein required for blood clotting is affected?