Question

The type of inheritance shown in the following pedigree chart is

• A. Autosomal dominant trait
• B. Autosomal recessive trait
• C. Sex-linked dominant triat
• D. Sex -linked recessive trait.

Answer 1

The correct option is B Autosomal recessive trait

If the disorder is recessive, neither parent has to have the disorder because

they can be heterozygous. The characteristic features of autosomal recessive inheritance is as follows:-

•Appears in both sexes with equal frequency

• Trait tend to skip generations

• Affected offspring are usually born to unaffected parents

• When both parents are heterozygous approx. 1/4 of the progeny will be affected

• Appears more frequently among the children of consanguineous marriages.

The given pedigree follows these features. So the correct option is 'Autosomal recessive trait'.