Question

What percent of identical (MZ) twins are concordant (in agreement) for a gay male sexual orientation?

A) 10%
B) 25%
C) 50%
D) 100%

Answer 1

Approximately C) 50% of identical (MZ) twins are concordant for a gay male sexual orientation.

Step-by-step explanation:

Research has indicated that identical (MZ) twins have a higher likelihood of sharing a sexual orientation compared to fraternal (DZ) twins.

A study conducted by Bailey and Pillard in 1991 found that there was approximately a 50% concordance rate for gay male sexual orientation among MZ twins.

This indicates that if one twin in an MZ pair identifies as gay, there's a 50% chance that the other twin also identifies as gay.