This pedigree is of a rare trait, in which children have extra fingers and toes. Which one of the following patterns of inheritance is consistent with this pedigree

Options

A. Autosomal recessive
B. Autosomal dominant
C. Y-linkage
D. Sex linked recessive

Answer

C

Explanation

Y - linked disorder are caused by mutations on the Y- chromosome from the their father, every son of a an affected father will be affacted. Because femlas inherit an X-chromosome from their father, female offspring of affected fathes are never affected.