Our genetic makeup - 'nature' - are the cards we're dealt. Education - 'nurture' - teaches us how to play the hand we got.
The OP's hard genetic determinism doesn't stand up scrutiny.
It’s long been known that our genetic makeup the word’ that makes us who we are plays an important role in how we behave even as it does in how we appear. There’s more to it than that, however: Epigenetics, a subfield of genetic study, deals not with the genetic code itself but with how genes express themselves in reaction to environmental conditions.
Researchers once believed the tags’ which govern genetic expression - whether they’re switched on’ or off’ in reaction to, for example, the experience of starvation or severe mistreatment are wiped out shortly after the zygote forms. Through a series of well-publicised studies, researchers discovered that some tags and especially those related to survival are passed from parent to child intact.
They were surprised to discover just how specific the tagged information could be:
http://www.nature.com/news/fearful-memories-haunt-mouse-descendants-1.14272
https://www.theguardian.com/science/2015/aug/21/study-of-holocaust-survivors-finds-trauma-passed-on-to-childrens-genes
On another note, if we are little else than the sum of our genetics, then in seems to assume that conjoined twins, who share everything from DNA to anti-bodies to personal experiences would be more alike then average siblings.
One intriguing set of twins raises questions not only about the role of DNA in forming a person’s habits and character but also about the nature and seat of consciousness:
Tatiana and Krista Hogen, born in 2006, are craniopagus twins joined at the head so completely that they share a strip of brain matter. This single strip makes the Hogen sisters unique in all of recorded history: They can see through each others’ eyes a claim researchers put to the test and found legitimate. (http://tinyurl.com/keo8w6w) Likewise, they can hear as one, they can communicate without speaking...and they fight. When they were younger they’d getting into scraps over who wanted to do what.
Their DNA is identical. Their upbringings are identical. They have shared every single experience since birth in ways no one else, including other craniopagus twins, ever has.
Another remarkable case of where conjoined twins have individuated involves is that of Lori and George (born Dori) Schappell: The two are joined at the head (but do not share brain matter) and of course have identical DNA. Like all other inseparable conjoined twins, they share and negotiate every single aspect of their lives. But whereas Lori identifies as a woman, her brother, George, a transman, does not.
Abby and Brittany Hensel are so closely linked that, at first glance, they appear to share one body. Although the torso appears nearly average in proposition, it contains two spines, two heats four loungs, and two stomachs. But while they’re admittedly close, cooperating to accomplish everything from two handed typing with one sister controlling her own side to peddling a bicycle and driving a car, they still disagree with each other on certain points. (One of the more interesting factoids about these two is that they are completely silent despite writing their e-mails two-handed.
The OP’s belligerent determinism doesn’t change the data: Either we still have a fairly limited understanding of our inner world, or we are indeed more than the sum of our parts.
