Linkage Studies Have Narrowed the Search for a Genetic Contribution

Linkage studies have narrowed the search for a genetic contribution to mood disorders by

A) establishing the need for longitudinal research on monozygotic twins who have been separated at birth.
B) pointing to gene combinations that appear in family members who have had symptoms of major depression.
C) identifying genes for which there is no link to mood disorders.
D) searching particular areas on a chromosome or several chromosomes that have a likelihood of containing risk genes.

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