I refer to the selection of genes. Everytime this happens in life, it is 100% random and independent of the result of the previous gene that was copied. When I say 50% exact, I mean a perfect cross between parents resulting in a perfect 50% child. That's not always thre case, a black family with the correct recesive genes could potentially produce a red headed light skin child; not necessairly a mutation, but a very new type of person from the parents dominant/recesive genes.
Ok, I thought you where speaking of chromosomes.
The selection of the chromosomes is in many cases not 100% random, and maybe even dependable of the earlier gene, with the splitting of chromosomes and the crossover of genes an really 50% exact cross between the parents seems hard too. Making a exact selection of the genes of 50% each and randomness for every gene possible, pretty plausible, everything is dependable of eachother. Genes aren't for nothing together in desame chromosome.
And the last sentance, that's not a case of genotype but of fenotype. It is true two cows with a hetero-zygote black gene could have a brown cow, chance is 25% roughly.
The whole dna-story in a whole is pretty complicated. But simply said there is nothing that is 100% random. If there are certain genes you took from your father you can predict that some others are too if they are in desame chromosome. I heard some genes even try to cheat to get in the dna.
The good point of sexual reproduction is indeed the mix of genes that didn't knew eachother before and they really work working together, you're right there.
What really is better then the 'normal' reproduction that depents for a big part on trial and error, altrough bacteria seem to exange eachothers genes too.
It has been stated before, but the reason DB hasn't got a complicated ecosystem and nature does. Is becouse nature is just a 'little' more complicated then DB.
I heard they tried to simulate a very small virus in a water drip, some time ago wih a supercomputer. That took some weeks to simulate it for a few seconds. The computer simulated literaly everything from every molecule. And nature can do it in real-time, and also then look how long it took to come this far.