Question

The following figure shows a family pedigree for a rare genetic disorder. What is the most likely mode of inheritance of this disorder?

Select one:
a. Autosomal recessive
b. X-linked recessive
c. X-linked dominant
d. Autosomal dominant
e. Y-linked

Answer 1

B.) X-linked recessive because

2) The unaffected son, not produced from the founding generation, has two unaffected parents but is still affected