According to the results of research involving twins and family members, which of the following has been suggested?

Question

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Research involving twins and family members has suggested that genes may play at least some role in determining a person's sexual orientation. This is based on the observation that identical twins are more likely to have the same sexual orientation than fraternal twins, and that homosexual individuals tend to have more gay relatives on both the maternal and paternal sides of their family. Option A is incorrect because research does not support the idea that homosexual men tend to have more gay relatives on one side of the family compared to the other. Option B is incorrect because while having a gay parent may increase the likelihood of a child being gay, research does not suggest that it raises their chance by approximately 70%. Option D is incorrect because there is no evidence to suggest that heterosexual siblings of homosexual individuals are more likely to choose to be heterosexual due to seeing the difficulties associated with being gay.

According to the Results of Research Involving Twins and Family