Being employed as a computer programmer does not mean you are bright.

A source for the heritability claim, to allay your scepticism: http://blogs.discovermagazine.com/gnxp/2012/06/heritability-...

It shows the heritability of intelligence at age 26 as 88%. Perhaps you're one of the 12% (forgive the statistically meaningless phrase - you get the idea). Or perhaps you underestimate your parents.

Likely the latter. Do not conflate renumeration or political views with intelligence, curiosity or just street smarts.

All of these forms of intelligence are genetically valid, but phenotype is determined by environment. You may get a great farmer, or you might get a researcher depending on environmental conditions...

So yes, they do matter a lot on outcome. If you haven't found a computer early, there could be a problem of you being outmatched and not proceeding alongside that path.

High heritability does not mean that there's a formula that you can apply to predict what a child "inherits". It's about probabilities in great numbers, not about individuals, hence the advice from ZhuanXia on what to do to increase the odds and then roll the dice a lot (have a lot of children) to increase the odds for a perfect roll in one of them.

Who can afford it though? Environment matters too. But if you can afford it, why not. Few can though, kids are expensive in time and money, and to get money you spend time...