In gremlins, hairy shoulders are dominant over non-hairy shoulders. Peter the Gremlin, who has very hairy shoulders, was adopted at birth and he is finally reunited with his parents 30 years later. He brought his girlfriend, Gretchen the Gremlin, to the reunion. Gretchen studies genetics in college, and notices that neither of Peter's parents have hairy shoulders. What are Peter's parents genotypes? What are Peter's possible genotypes? Why do you think that Gretchen is concerned?