Henry Goddard's investigation of approximately 1,000 descendants of Martin Kallikak (a pseudonym), a soldier of the American Revolution, illustrates which of the following research methods?

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Henry Goddard's investigation into the descendants of Martin Kallikak is an example of a family study. This method involves examining the hereditary patterns of traits or diseases within a family to understand how they are passed through generations. Goddard's work focused on the inheritance of intellectual disability within the Kallikak family.

Henry Goddard's Investigation of Approximately 1,000 Descendants of Martin Kallikak