Your genes are a blueprint of who you will be,
Your traits being a function of heritability.
From 0 to 1 your traits are all measured,
With environment and genes which both endeavored
To explain the way that they are expressed,
However the truth is its really complex
Traits can have multiple factors and be polygenic,
The permutations can drive someone manic.
Also, your genes can be pleiotropic,
Making our understanding of genetics seem quite myopic
Genes give an outline but show only so much,
Whether African, Irish, Italian or Dutch,
You are also affected by where you call home,
Influenced by environment and where your ancestors roamed.
Nature and Nurture both working in tandem
Result in variety that may just seem random.
Diseases can spread in ways seeming systemic,
But environmental factors are what make it endemic.
Studying lifestyle and environmental effects is a must,
Since even the healthy can be hit by a bus
In short your genes don’t work in a vacuum,
A predisposition does not always mean doom.
As for what makes me me, it’s easy to see
The traits that are expressed individually.
My height and my hair and skin kind of fair
But that just describes me physically.
I also have attributes harder to chart,
My love of good books, and appreciation of art.
Genetics provide a great way to start,
But people are more than the sum of their parts.