When examining the concordance rates of homosexuality between identical twins and fraternal twins or non-twin siblings,the following has been reported by research: if one identical twin is gay,his brother has a ________% chance of being gay as well.If a fraternal twin or a non-twin sibling is gay,his brother has a ________% chance of being gay as well.

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Research has shown that if one identical twin is gay, there is about a 52% chance that the other twin is also gay. For fraternal twins or non-twin siblings, the concordance rate is approximately 22%.

When Examining the Concordance Rates of Homosexuality Between Identical Twins