Albinism and phenylketonuria are disorders due ot

Options

A. Recessive autosomal genes
B. Dominant autosomal genes
C. Dominant sex genes
D. Recessive sex genes

Answer

**Step-by-Step Solution:**

1. **Identify the Disorders**: The question mentions two specific disorders: albinism and phenylketonuria (PKU).

2. **Understand the Genetic Basis**: Both albinism and phenylketonuria are genetic disorders. It is important to know how they are inherited.

3. **Determine the Type of Gene Involved**: The question provides multiple-choice options regarding the type of genes responsible for these disorders: recessive autosomal genes, dominant autosomal genes, dominant sex genes, and recessive sex genes.

4. **Research Albinism**: Albinism is caused by a deficiency in melanin production. This condition occurs when an individual inherits two copies of a mutated gene (one from each parent) responsible for melanin synthesis.

5. **Research Phenylketonuria (PKU)**: PKU is a metabolic disorder caused by the inability to metabolize phenylalanine due to a deficiency in the enzyme phenylalanine hydroxylase. Like albinism, PKU requires two copies of the mutated gene for the disorder to manifest.

6. **Conclusion**: Both disorders are caused by the presence of recessive alleles on autosomal chromosomes. Therefore, the correct answer is that albinism and phenylketonuria are disorders due to recessive autosomal genes.

**Final Answer**: Albinism and phenylketonuria are disorders due to **recessive autosomal genes**.

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