Answers:
1. Independent Clause - Mrs. Clarke is the elderly woman whose cake won first prize in the contest at the fair last year.
2. Relative pronoun - whose
3. Dependent Clause - ...whose cake won first prize in the contest last year.
Step-by-step explanation:
1. This sentence can stand alone, so it is an independent clause.
2. The most common relative pronouns are who, whom, whose, which, that. The relative pronoun we use depends on what we are referring to and the type of relative clause. In this case, the relative pronoun is "whose".
3. This sentence fragment depends upon an independent clause.