Tuesday, March 6, 2012

Black and white twins born

A white baby girl with a mop of blonde hair and blue eyes has been born to black parents living in London. How is this possible? While there have been several cases of different coloured twins born to parents with mixed-race ancestry in recent years, Ben and Angela Ihegboro, who are originally from Nigeria, say they have no such origins which could explain the phenomenon that is their new daughter Nmachi. In the case of Nmachi, there are three possible explanations of why she looks so very different from her older brother and sister, who are both black: dormant white genes which entered both of her parents' families long ago, a genetic mutation unique to her, or albinism. Contrary to reports, doctors at the London hospital where Nmachi was born say they have not ruled out this recessive disorder which affects skin pigmentation. Continue reading the main story Related stories Black and white twins born Mix and match Like many human traits, a person's colour is influenced by about 12 different genes, which together control the amount of pigment - or melanin - produced in the skin. It is in principle at least possible that both parents carried light skin gene variants, inherited from unknown white ancestors on either side, which in their cases were masked by dark skin gene variants. Continue reading the main story " Start Quote We are all of us genetic mixtures to some extent and occasionally you'll have a convergence of the pale versions of these genes in African Americans ...



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