Answer:
The best answer to the question: Which term describes the individual in a pedigree whose phenotype was first brought to the attention of a medical researcher? would be: Proband.
Step-by-step explanation:
The reason for this being the correct answer is that a proband, also known as proposito (for males) and proposita (for females) is known as the first member of a group (animal or human), most likely a family member, on whom a particular condition is appearing, and who is the first to seek medical help for it. The pedigree is further formed starting from the proband and relationships in groups and families to the proband are built with proper symbols to denote the relationship existent. In males the symbol used is a square and in females a circle. Usually these probands are used to study genetic disorders and the relation with the entire family group that springs forth from that proband.