Question

Read the passage given below and answer the question that follow:

Analysis of the pattern of inheritance of a particular trait through several generations of a family is called pedigree analysis. A graphic representation of the same is called a pedigree chart. It may be used to guess the probability of a child inheriting the trait under study. pedigree chart is drawn by using a standard set of symbols.

Phenylketonuria is an example of ______.

Options

• Autosomal dominant trait

• Autosomal recessive trait

• Sex linked recessive trait

• Sex linked dominant trait

Answer 1

Phenylketonuria is an example of autosomal recessive trait.

Explanation:

Phenylketonuria is an example of an autosomal recessive trait. This means the disease appears when an individual inherits two recessive alleles, one from each parent, who might be carriers without showing symptoms. It is caused by a mutation affecting the enzyme phenylalanine hydroxylase, leading to metabolic problems if untreated.