Study the pedigree chart given below

What does its show

Options

A. Inheritance of a sex-linked inborn error of metabolism like phenylketonuria
B. Inheritance of a condition like phenylketonuria as an autosomal recessive trait
C. The pedigree chart is wrong as this is not possible
D. Inheritance of a recessive sex-linked disease like haemophilia

Answer

D

Explanation

In the given pedigree chart, squares are representing males and circles females. In `F_(1)`-generation, 1-male and 1-female are diseased and in next generation only male is diseased. This shows the inheritance of a recessive sex-linked diseases like haemophilia.