where does the blue eye gene come from
Eye color In humans, the inheritance pattern followed by blue eyes is considered similar to that of a recessive trait (in general, eye color inheritance is considered a polygenic trait, meaning that it is controlled by the interactions of several genes, not just one).[14] In 2008, new research tracked down a single genetic mutation that leads to blue eyes. "Originally, we all had brown eyes," said Eiberg.[35] Eiberg and colleagues suggested in a study published in Human Genetics that a mutation in the 86th intron of the HERC2 gene, which is hypothesized to interact with the OCA2 gene promoter, reduced expression of OCA2 with subsequent reduction in melanin production.[36] The authors suggest that the mutation may have arisen in the northwestern part of the Black Sea region, but add that it is "difficult to calculate the age of the mutation."[35][36][37]
Blue baby syndrome Blue baby syndrome refers to at least two situations that lead to cyanosis in infants: cyanotic heart disease and methemoglobinemia. The most common cyanotic heart defects include transposition of the great vessels, tetralogy of Fallot, persistent truncus arteriosus, tricuspid atresia and total anomalous pulmonary venous return.