Researchers have identified two genes that can explain why some women are likely to have non-identical twins. While it is known that if a woman's female relatives have non-identical twins she is more likely to give birth to twins herself the genes behind this phenomenon have remained a mystery. There's an enormous interest in twins and in why some women have twins while others don't said one of the researchers Dorret Boomsma biological psychologist at Vrije Universiteit (VU) Amsterdam in the Netherlands. The question is very simple and our research shows for the first time that we can identify genetic
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