  The immense diversity of the galaxy population in the universe is believed to
stem from their disparate merging and star formation histories, and multi-scale
influences of diverse environments. No single causal factor of the initial
state is known to explain how the galaxies formed and evolved to end up
possessing such various traits as they have at the present epoch. However,
several observational studies have revealed that the key physical properties of
the observed galaxies in the local universe appeared to have a much simpler,
lower-dimensional correlation structure than expected, the origin of which
remains unexplained. Speculating that the emergence of such a simple
correlation structure of the galaxy properties must be triggered by nature
rather than by nurture, we explore if the present galaxy properties may be
correlated with the initial precondition for protogalaxy angular momentum,
$\tau$, and test it against the data from the IllustrisTNG300-1 hydrodynamic
simulation. Employing Shannon's information theory, we discover that $\tau$
shares a significantly large amount of mutual information with each of the four
basic traits of the TNG galaxies at $z=0$: the spin parameters, formation
epochs, stellar-to-total mass ratios, and fraction of kinetic energy in ordered
rotation. These basic traits except for the stellar-to-total mass ratios are
found to contain even a larger amount of MI about $\tau$ than about the total
masses and environments for the case of giant galaxies with $11.5\le
\log[M_{\rm t}/(h^{-1}\,M_{\odot})]<13$. Our results imply that the initial
condition of the universe must be more impactful on the galaxy evolution than
conventionally thought.
