Jonah and Jared are fraternal twins. Jonah is gay. What is the approximate likelihood that Jared is gay as well?
A) 5%
B) 10%
C) 20%
D) 50%

Question

Quizplus · Accepted Answer

Fraternal twins share approximately 50% of their genetic material, just like any siblings, which means they could inherit similar or different genetic traits. Studies have found that the concordance rate for homosexuality in fraternal twins is around 20%, meaning that there is a 20% chance that a fraternal twin of a gay person will also be gay. Therefore, the approximate likelihood of Jared being gay is 20%.

Jonah and Jared Are Fraternal Twins