Researchers have found that among male identical (monozygotic) twins, when one twin is gay, about ______ percent of the time, the other twin is also gay.

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Studies have shown that the concordance rate (the chance of both twins having the same trait or characteristic) for sexual orientation is higher among identical twins compared to fraternal twins. While the concordance rate is not 100%, it is estimated to be around 50% for male identical (monozygotic) twins, meaning that if one twin is gay, there is a 50% chance that the other twin will also be gay.

Researchers Have Found That Among Male Identical (Monozygotic) Twins, When