Now I would wager that in the United States, these are the most well-known chromosomes for one simple fact: that we say X equals "girl," and Y equals "boy" -- that they are responsible for sex.
Apostaría que en EE. UU. son los cromosomas más famosos por un simple hecho: porque decimos que X  es igual a "niña," e Y igual a "niño", es decir, que son  los responsables del sexo.