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The correct answer is among identical twins; if one brother is gay, the other brother has a 48-65 per cent chance of also being gay.

The genetic influence on sexual orientation has been supported by research reporting that among identical twins if one brother is gay, the other brother has a 48-65 per cent chance of also being gay.

  • According to the study, there is a 66% concordance rate of homosexuality among the identical twins.
  • About 1 in 250 has the chance of having identical twins.
  • The DNA of the monozygotic twins tends not to be all 100% identical.

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