Research on the biological factors associated with homosexuality has focused on concordance rates for monozygotic and dizygotic twins. The results of such studies of gay men and lesbian women have shown higher concordance rates for ________ twins, which supports the view that sexuality ________ genetically determined.

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Research indicates higher concordance rates for monozygotic (identical) twins than for dizygotic (fraternal) twins, suggesting a genetic component to sexuality. Monozygotic twins share more of their genetics than dizygotic twins, so higher concordance rates among them support the idea that sexuality may have a genetic basis.

Research on the Biological Factors Associated with Homosexuality Has Focused