The American Declaration of Independence famously states that "All men are created equal." This was intended to declare that we're all morally equal (i.e. equal under the law), not equal in all respects.
Whereas I strongly agree that we're all morally equal and that no one should be discriminated against for any reason, including their genes, I think moral equality has a problem. Having different genes leads to differences in interests, dispositions, personality and temperament.
If you're genetically disposed to defer gratification, your SAT scores will be, on average, 200 points higher than those people who lack those genes. Having a higher SAT score will get you into a top university, and employers in the modern information economy (like Yahoo's Marissa Mayer) openly admit that they only want to hire employees with a degree from a prestigious university. The talent pool for top jobs is very small, leading to a bidding war by corporations for top talent. Corporate CEOs make 300 times more than the average employee.
In other words, moral equality alone is not enough. It leads to income inequality. "The top 10 percent of earners took more than half of the country's total income in 2012". Job promotions in corporations are usually given to extroverts and extraversion has been shown to be an innate trait.
Those with talent often claim (with indignation) that they deserve all the money they make and should be allowed to keep it. But in the age of genetics, these claims have been revealed as myths. Character traits like drive, confidence, energy, and tenacity all have a genetic foundation, allocated by chance. Unfortunately, we humans appear to be hardwired to believe in free will, even as it has been scientifically disproven.
So, if genetic differences among us which we carry by no fault of our own (I never chose my genes, I was born this way) lead to lower income and wealth, then this is unfair and should be addressed. Certainly this unfairness justifies higher taxes on the talented, and wealth redistribution from the genetic haves to the genetic have nots.
In the very near future, when we discover the underlying genes responsible for the traits and dispositions correlated with success (in business, arts, sports, culture, science, etc), and the rich begin scrambling to select and improve the genes of their future children, we should ensure that these services are available free to all, rich and poor alike, and that parents, not government, are the final arbiters of their children's genes.