> if someone is born from a poor and dumb family that therefore their genetics must be worse and so forth. That particular assumption would be false because of

> if someone is born from a poor and dumb family that therefore their genetics must be worse and so forth. That particular assumption would be false because of genetic crossover. Two mentally disabled people could give birth to a genius child if recombination results in an offspring not carrying or expressing whatever causes their disability. The probability of this happening is higher if the pair is less closely related. The inverse can also happen of course, and does. This is really why sexual reproduction seems to exist. It's also why the racial purity crowd has it precisely wrong. One hypothesis on the Flynn Effect is that it could result from increased outbreeding due to modern levels of travel and migration.