Answer:
Family Pedigree
Step-by-step explanation:
Family pedigree is a genetic charts of a family tree that shows the inheritance of a trait or disease from generations to generations by showing the relationships between family members, thereby indicating which individuals carry the trait through their medical histories.
A researcher who wants to examine the relatives of people with unipolar depression to see whether the disorder affects other family members should complete a FAMILY PEDIGREE study which will shown him the medical histories of each individual in the family and enable him to know whether the disease or disorder affects other family.