<Li> <P> Sectoral hypochromia in a blue merle Border Collie . </P> </Li> <P> Sectoral hypochromia in a blue merle Border Collie . </P> <Li> <P> A cat with complete heterochromia . </P> </Li> <P> A cat with complete heterochromia . </P>

How common is one blue eye and one brown eye