So what this means now is that those traits we then look at and so readily see — facial features, skin color, hair structure — are not determined by single genes with big effects, but are determined by many different genetic variants that seem to vary in frequency between different parts of the world.
Ahora bien, esto significa que esos rasgos que luego miramos y vemos tan fácilmente... rasgos faciales, color de piel, estructura del cabello... no están determinados por genes simples de gran efecto sino por muchas variantes genéticas diferentes que parecen variar en frecuencia entre diferentes partes del mundo.