Based on the notion that there seems to be a genetic component involved in homosexuality, and that homosexual participants in one study had more homosexual male relatives on their mother's side of the family, researchers suspect that sexual orientation is determined by __________

Question

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The study found that homosexual participants had more homosexual male relatives on their mother's side of the family, indicating a possible genetic influence from the X chromosome contributed by the mother. Therefore, choice A (genes on the X chromosome contributed by the mother) is the best option. Choices B, C, and D are not supported by the study mentioned in the question.

Based on the Notion That There Seems to Be a Genetic