Question

a researcher wants to do a family study (aka - a pedigree study) on homosexuality. what would be a difficulty with this approach? a. there may be assumptions made about the behaviour of family members. b. determining which specific genes are responsible for sexuality. c. defining homosexuality. d. there would be too many confounding variables.

Explanation:

Family/pedigree studies on homosexuality face the core issue that shared genetics and shared environment (confounding variables like family upbringing, social norms within the family, etc.) cannot be easily separated. These multiple confounding variables make it hard to isolate the actual cause of observed patterns, as opposed to the other options: defining homosexuality is a broader methodological issue not unique to pedigree studies, specific gene identification is a later step, and assumptions about family behavior are not the primary difficulty of this approach.

Answer:

D. There would be too many confounding variables.