haha it means, "and there you go", ie, "you put the cake in the oven and Bob's your uncle, it's cooked.
this an aussie expression.
What you'd get is Bach's idential twin, with exactly the same capacities. That's why it would be a fascinating experiment in the old nature versus nurture argument.
You're wrong about this
There's very little evidence (not even hypothetical one) that DNA and genes contain information about capacities, even on twin studies these hasn't been proven
If you clone Back what you get is someone who has the same genetics of Bach but this person will have a completely different life, will be exposed to completely different things, will live in a completely different period in time and culture, will do completely different thinks and have completely different friends, relatives and parents
The end result he won't be Bach at all. He could never develop good coordination or could even hate music. He could never develop musicality and especially he would never "automatically" write in the style we know ... because again that was a matter of the cultural background he lived in. Even if he manifested an interest in music and would become a musician he could compose soundtracks in impressionist style and never consider baroque music at all
The old nature vs nurture is a non-issue
There's almost zero evidence that nature has anything to do with the people we are and more than enough evidences that nurture and environment have everything to do with it
So far all experiments (with their tons of variables) and studies trying to prove point about inborn static personalities, attitudes and skills have failed miserably
Studies on hormones have failed to show that pre-existing hormonal levels influence the person behavior. What they showed instead is that independent choices influence the hormonal output. The wider perspective on testosterone studies is not that testosterone influence aggressivity in anyway but that aggressivity itself results in a raise of testosterone.
Researches about brain activities difference between male and female failed to show any biological explanation. What was showed instead is that brain activity was proportional to brain usage and different life-experiences stimulating certain areas and that these were dependent on what kind of experiences people were conditioned to try to avoid according to cultural ideas about gender. Lower activity in the emotional receptors in male was found to be due to limited cultural beliefs about what is mainly and what is not forcing certain neural paths and neglecting others. All studies that tried to study a behavioral makeup that would allow them to predict the choice of a person in advantage failed. What happened is that all subjects chose according to the circumstance and the environment and never according to some non-existant behavioral genetical makeup
The belief instead that we have (or are supposed to have) static behaviors and attitudes has been disproven by realizing that even opting for one specific "personality" rather than changing it according to different circumstances is due to cultural pressure. Cross-cultural studies found there's no biological basis for this when the environment and the culture doesn't promote this
Even perceptive and thought elaborative differences between different generations and ages have been shows to be a product of what kind of culture, experiences and prohibitions kids are exposed to rather than an arbitrary biological fact. A good book "Centuries of Childhood" showed through cross-cultural analysis and studies how there can't be any universal and biological basis for age-adequate skills and intellect since they have been changing impressively among cultures denying any biological rule behind them (i.e. it's a biological fact that we need to eat to survive ... hence there's no culture worlwide that live without eating)
The genetist Lewontin wrote a book (The Triple Helix) to warn laymen about the illusions of genetics
According to Lewontin any focus on genetics without considering the even stronger influence of environment is flawed.
We don't exist without an environment. That why we are independent beings who can move, perform actions and record information. In a blank existence, if we were born in an eternal blank, we wouldn't not only be identical but we would also be less than vegetables; everything we are is a product of the way we interact with what is around us ... without that we're more than dead. We're slaves of the environment we live in but that also means we're not shaped statically but are free to choose how to react to the circumstances we meet everyday
That's why eventually while they showed that there's a genetical predisposition to diabetes, it only increases the change of developing the disease giving certain external factors ... but the external factors are the only possible triggers.
This applies to heart disease, cancer, PCOS and many other conditions too
So far whoever say that genetic predisposition to a disease means you're going to get sick is just being very scientifically incorrect ... and is most likely a quack (of course there are even quacks with Ph.D. and practicing licences)
Again recently it has been found out that "a disease running within a family" is more a matter of kids taking up the lifestyle and dietary habits of their parents rather than a real biological heritage. Recent studies again found that genetics is less to do with height than we thought in comparison to environment
Then there's the even more complex concept of environment during pregnancy.
We're already being influenced by the environment as we are in the womb
There are certain evidences that our musicality is being influenced already by what our mother is listening to as we're still in the womb. Which again would make it even harder (if it wasn't hard enough before) to believe that a clone of Bach would ever be a pianist or a musician ... since everything that made Bach BACH would be necessarily be lacking to his clone
While exaggerated claims by pseudoscientific zealots with an agenda may suggest that by cloning Bach you'll get another great harpsichordist, organist, pianist and composer with similar skills and creativity and ideas that his clone had, evidences suggest otherwise and suggest that you'll never be able to predict what this person will take up or will be, think and choose. The chances that the clone of Bach will ever be interested in piano playing and music are very very weak