Discussion of everything related to the Theory of Evolution.
Cat, I can't think of any evidence that suggests that survival traits are lost in genes. In the case you mention of plants bred to be resistant, their reversal to an older type in the absence of the threat is a simple reversion to a 'setting' which is quite recent. If we carried antibodies to every disease that has ever existed we wouldn't have room for our blood to function properly. So the genes only pass a trait on for a few generations if it has no current survival value.
As to the behaviour of domestic animals that is nurture not nature. We have bred traits into domestic animals which make them less likely to survive in the wild, things like loss of cryptic colouration, and shortening of the skeleton, and it has been proven that in feral populations these traits quickly disappear due to natural selection, but there is no evidence that there is a permanent deterioration in behaviour once the necessary survival skills have been relearned. There is sometimes alteration in behaviour, but behaviour is altering all the time in wild populations too.
Animartco, in part you are right. However, no amount of learned survival skills would help Teacup Chiwawa survive in absence of humans. Also, when you say that traits of domestic animals that disappear in wild population, they disappear due to infusion of genes from interbreeding with other wild populations. Thus, the "feral" population is not genetically the same as domestic.
Besides, you cannot judge the wild dog survival skills as long as there is a constant source of food - human trash. They do not need to hunt the prey to survive. So, your guess is as good as mine how many of them will survive if they have to compete with wolves for the rabbits...
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