re: If homosexuals are “born that way”

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So, the male homosexuals (obviously) are not passing those markers to the next generation in great numbers, but their straight sisters ARE doing so.

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If this is true then gay men should have far more genetic traits which are only passed from the mother like mitochondrial conditions, veracious veins and color blindness.

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This study did find that most of the genetic markers in question are found on the X chromosome, so your point would make sense. I have no idea whether anyone has pursued that line of inquiry.