We are multitudes

PhotoWomen are chimeras, with genetic material from both their parents and children. Where does that leave individual identity?

‘Within weeks of conception, cells from both mother and foetus traffic back and forth across the placenta, resulting in one becoming a part of the other. During pregnancy, as much as 10 per cent of the free-floating DNA in the mother’s bloodstream comes from the foetus, and while these numbers drop precipitously after birth, some cells remain. Children, in turn, carry a population of cells acquired from their mothers that can persist well into adulthood, and in the case of females might inform the health of their own offspring. And the foetus need not come to full term to leave its lasting imprint on the mother: a woman who had a miscarriage or terminated a pregnancy will still harbour foetal cells. With each successive conception, the mother’s reservoir of foreign material grows deeper and more complex, with further opportunities to transfer cells from older siblings to younger children, or even across multiple generations….’

Via Aeon