Researchers believe mothers pass homosexuality onto their sons, and fathers pass it onto their daughters.

Scientists say they may have discovered why homosexuality exists.

Researchers from the National Institute for Mathematical and Biological Synthesis have said the genetics that makes a person more likely to be gay are passed from fathers to daughters and mothers to sons.

They suggest the answer lies in epigenetics, or how the expression of genes is controlled by ‘temporary switches’, such as how a gene behaves, known as epi-marks.
Gender-specific epi-marks are usually ‘erased’ from generation to generation, but when they do not and they pass from a parent to a child, it can result in homosexuality.

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