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What is the genetic basis for same-sex fraternal twins?

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What is the genetic basis for same-sex fraternal twins?
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Its the same genetic make-up as any two brothers or two sisters. Since they develop from two different eggs fertilized by a sperm each
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It would be the same as between normal siblings, only identical twins have the same genetic makeup cuz they came from the same cell.
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Genetic make up is exactly the same as a brother and brother or a sister and sister, born at separate times.. . Only twins are born at the same time.
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Fraternal twins are as genetically related as any other pair of siblings, about 50% on average.
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The same as a pair of same sex siblings.
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