In the following pedigree chart, the mutant trait is shaded black. The gene responsible for the trait is

Question

$\begin{array}{1 1} \text{a. Dominant and *** linked} \\ \text{b. Dominant and autosomal} \\ \text{c. Recessive and *** linked} \\ \text{ d. Recessive and autosomal.} \end{array}$