William is a graduate student interested in studying the genetic influences on sexual orientation. One of the first things that William learns is that

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Research has shown that identical twins, who share all of their genes, are more likely to both be gay than non-identical twins, who only share about half of their genes. This suggests a genetic component to sexual orientation. However, the relationship is not absolute, indicating that other factors, including environmental influences, also play a role.

William Is a Graduate Student Interested in Studying the Genetic