Lorenzo has a double row of eyelashes, which he inherited from his mother as dominant trait. His maternal grandfather is the only other relative to have it. Maria, who has normal eyelashes, marries Lorenzo. Their first child, Nicola, has normal eye lashes. Now Maria is pregnant again and hopes for a child with double eye lashes.

a. Draw a pedigree showing this family. Include Lorezo's parents and grandparents. Be sure to use the correct symbols, numbers, and generations.

b. Calculate the probability of the second child inheriting double eye lashes.