Which set of siblings is most likely to share a homosexual orientation?
A) Carlos and Juanita, who are fraternal twins
B) Reagan and Kennedy, who are identical twins
C) Kendall and Randi, who are adopted siblings
D) Quentin and Russell, who are biological, non-twin siblings

Question

Quizplus · Accepted Answer

Research suggests that identical twins have a higher concordance rate for homosexuality compared to fraternal twins, adopted siblings, or non-twin siblings. This indicates that genetics play a role in sexual orientation.

Which Set of Siblings Is Most Likely to Share a Homosexual