A) Inheritance of a condition like-phenylketonuria as an autosomal recessive trait
B) The pedigree chart is wrong as their is not possible
C) Inheritance of a recessive sex-linked disease like hemophilia
D) Inheritance of sex-linked inborn error of metabolism like-phenylketonuria
E) None of the above
Correct Answer: A
Solution :
This chart shows inheritance of an autosomal recessive trait like-phenylketonuria. An autosomal recessive trait may skip a generation. It appears in case of marriage between two heterozygous individuals (Aa \[\times \] Aa = 3Aa + 1 aa), a ressive individual (aa \[\times \] aa = all aa). Phenylketonuria is an inborn autosomal, recessive metabolic a disorder in which homozygous recessive individual lacks the enzyme phenylalanine hydroxylase. The hetrozygous individuals are normal, but earners.
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