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Nature encourages mothers to pass on a "gay trait" to their male offspring by boosting their fertility, the Italian University of Padova team believes.
Scientists have said it might be that the mother develops some kind of resistance to the male Y chromosome in her offspring that makes subsequent baby boys more likely to be born gay.
Scientists doing DNA studies on homosexual brothers pinpointed 'culprit' genetic material to a region of the X chromosome that mothers pass on to their offspring.