In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

Options

A. Autosomal dominant
B. X-linked recessive
C. Autosomal recessive
D. X-linked dominant

Answer

C

Explanation

The given pedigree shows the autosomal recessive disorder. In this disorder, the individual inherit two mutated genes, one from each parent. This disorder is usually passed on by two carries. Health is rarely affected, but individual have one mutated gene (recessive gene) and one normal gene (dominant gene) for the condition. The carries have a 25% chance of having an unaffected child with normal genes, 50% chance of having an unaffected child who also is a carrier and a 25% chance of having an affected child with recessive genes.