Answer :
Final answer:
In the sentence provided, the correct relative pronoun is who because it refers to the subject, Dr. Marlene Zuk. Unlike whom, which refers to an object, who is used when the subject is performing the action. Thus, the completed sentence should read with who: "Dr. Marlene Zuk, who studied crickets..."
Explanation:
Using Relative Pronouns: Who and Whom
In the given sentence, the appropriate relative pronoun to use is who. This is because who is used to refer to the subject of a verb, which in this case is Dr. Marlene Zuk. The correct construction would read: "Dr. Marlene Zuk, who studied crickets on the Hawaiian island of Kauai, discovered that a mutation in the genes of male Kauai crickets prevents their wings from making a chirping sound." On the other hand, whom is typically used to refer to the object of a verb or preposition, as in the phrase "to whom I spoke." Since Dr. Zuk is performing the action (studying), we choose who over whom.
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