In Two Twin Studies Cited in Your Textbook,it Was Found

In two twin studies cited in your textbook,it was found that the percentage of monozygotic twins in which both twins are homosexual was 50 percent.Approximately the same,or a slightly lower,percentage of non-twin brothers or sisters was homosexual.What does this pattern of findings suggest?

A) The environment determines sexual orientation.
B) Genes are not an influence for sexual orientation.
C) Genes are only one influence for sexual orientation.
D) Homosexuality is determined by genetics.

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