This is one of those rare opportunities I have to agree with you, and, to support your point.
"... a lifestyle can add another genetic compound to the brain,..."
With a slight modification...our DNA, rather than being mutated, seems to be ready to accomodate changes beneficial to the species.
"a. [T]he frontal cortex gives humans, unlike animals, the potential to control urges from the limbic system, whether for the second piece of red velvet cake or for the brunette behind the Starbucks counter. Next time you go to the zoo, look at the chimpÂ’s low, recessed brow. Then check out your own bulging pate. That, clever reader, is your frontal cortex.
b. While biology may suggest that the human male canÂ’t be expected to remain around for long, scientists are apt to describe the brain as chemically and neurologically predisposed to certain behaviors, and, in humans, it is a mistake to underestimate the environmental pressure of social norms. The human record suggests that social norms, especially the universal one of marriage, can reinforce fathersÂ’ ties to their children, which in turn might even become part of the male neural architecture.
Recently, neuroscientists have even discovered evidence that married menÂ’s testosterone levels fall at the birth of their baby."
KAY S. HYMOWITZ
Femina Sapiens in the Nursery
The conflict between parenting and career is hardwired in the female brain.
Femina Sapiens in the Nursery by Kay S. Hymowitz, City Journal Autumn 2009