Marko and Perez pictured after the Italian Grand Prix last weekendRed Bull motorsport adviser Helmut Marko has apologised for blaming Sergio Perez's inconsistent form this season on his ethnicity.The 80-year-old is an influential figure, who effectively chooses the drivers for both the drinks company's teams.Marko said in a statement: "I would like to apologise for my offensive remark."I want to make it absolutely clear that I do not believe that we can generalise about the people from any country, any race, any ethnicity."The Austrian, who issued his statement via Red Bull's Servus TV website, added: "I was trying to make…