What is Hantigen? Illustrate its role in the emergence of Bombay phenotype. (UPSC 2011, 20 Marks, )

What is Hantigen? Illustrate its role in the emergence of Bombay phenotype. (UPSC 2011, 20 Marks, ) EN ह function dochangelang(val) { if (val != "") { window.location = val; } }