Why do kids born to mixed-race, inter-caste or inter-religion relationships mostly follow the father's lineage of caste, religion, race or nationality? Isn't that blatant discrimination against entire ancestral generations of the mother's side?

Why do kids born to mixed-race, inter-caste or inter-religion relationships mostly follow the father's lineage of caste, religion, race or nationality? Isn't that blatant discrimination against entire ancestral generations of the mother's side?