Who is responsible for the sex of the offspring male or female .why?

Only the male because when their 4 gametes are generated from meiosis, 2 will carry the Y chromosome and 2 will carry the X chromosome. 
The female's 4 gametes will all only carry the X chromosome. 
Males are only created when Y from the male gamete fuses with a X egg from the female. 
Females are only created when X froth male gamete fuses with a X egg from the female.

Male, because they select the gene because xx girl and xy is boy. so he chooses x or y.

Heyhonestly, probably not. humans have always had a tendency to waste things. whether it's food, cosmetic, infrastructure, or our abandoned constructions,the landscape is littered with the refuseof man. archaeology wouldn't be a developed discipline if humans didn't leave things behind. in a way it makes us human

hope it mark me as brainlieast.