I am afraid that the author's statement may be sending an unintended wrong signal. What if a set of genes defining intellect (or stupidity) is discovered? Can we then go back to the old ways of racial discrimination? I am sure the author of that letter did not mean this.
It is a simple fact that we are a product of our genes and nurture. People with varying degrees of intelligence come in all races. There is sufficient difference even among siblings, which implies that intelligence knows no race. Let us accept the fact that we are not created equal. This difference has nothing to do with family, race, or religion. Let us work toward a free and fair world in which everyone can reach his or her fullest potential irrespective of race, religion, or some other secondary difference.