It used to be thought that those sex-determining chromosomes pictured here -- XY if you're male, XX if you're female -- merely determined whether you would be born with ovaries or testes, and it was the sex hormones that those organs produced that were responsible for the differences we see in the opposite sex.
Pensábase que eses cromosomas que determinan o sexo, representados aquí --XY se es home, XX se es muller-- só determinaban se ti nacerías con ovarios ou testículos, e eran as hormonas do sexo que  eses órganos producían as responsables das diferenzas que vemos no sexo oposto.